X is a male dracnari and gorgeous scales of insane rainbow colours coat his entire body in a dizzy pattern.

Missing a period preceding '..His long arms..' and, in the same sentence, '..have muscular look' should be '..have a muscular look..' or, I suppose, '..have muscular looks..'. Everything else looks very well thought out!

Anybody willing to critique my description?

He is a nimble faeling and his figure is slender and wiry, lacking significant muscular definition.
Standing marginally taller than the majority of his winged brethren, Alysi emanates a vague aroma of
sea salt, and his visible skin is bronzed from years of the sun reflecting off waves and scorching
his body. With a remarkably clean-shaven appearance, his coarse inky hair is slicked back and
unnaturally oily from the application of an excessive quantity of barnacle slime. His sharp cheekbones
accent a meticulously tailored goatee, which has a long pointed tip that curls upwards. A thin sneer
is plastered across his prolonged face, emphasized by a pair of animated eyebrows that seem to be
permanently fixed at a downward angle. Alysi's lone eye is a vibrant crimson color, constantly
swirling with various sanguine hues. A mangled cavity sits in place of his right eye, hollow and
ominous. His shriveled wings are transparent, veiny, and littered with scars. A rudimentary scarlet eye has
been tattooed on the inside of his left wrist, its origins unclear.

bolded are corrections, italics indicates a word that seemed odd, but I couldn't think of a suitable replacement that sounded similar. Haggard might be a choice for just traight-up replacing it though

..and is slightly shorter than others of his race. His compact form lends itself to evidence a state of superior fitness, each group of muscles taut beneath a lean, furred exterior the colour of sandstone. Focused eyes the colour of deep cerulean sit slightly canted in shadowed hollows beneath a pronounced brow, shining with a calculating intelligence. The steep angles of both cheek and jawbones impose an expression of solemnity carried through even in the set of his mouth, which is habitually drawn downward in a thin, serious line. A profusion of straight blue-black hair sprouts from his temples and across his crown, and is pulled back in a tight queue that exposes a set of triangular, tufted ears whose subtle movements seem orchestrated to catch the merest whisper of sound.

She is a noble merian and has a quiet, fragile air about herself. Standing just beneath six feet in height, she has a willowy figure that appears to lack the generous curves most of her gender possess. Porcelain-esque, stark coloring speaks of an affinity for ice, the faint lines of veins visible beneath her exposed flesh while glassy translucent blue-gray scales run along the upper skin of her calves, arms, and from the base of her skull down to the small of her back. Two elegantly fanned ears peek out from voluminous snowy white waves that appear to have a life of their own, the wild locks beginning to taper off once they've grown past the middle of her back, sparkling with an opaline iridescence in the light. Curling wisps of hair frame Emilynn's heart-shaped face, the merian possessing delicately formed facial features excepting for a long, slightly flattened nose. Large silver eyes, lacking both pupil and iris, are heavily lined with eyelashes while eyebrows above have a shallow arch to them. White teeth have a sharpened appearance, the points of her canines longer than the rest but not enough to show when her mouth is closed. Bowed lips are of a pale blue colour, the corners appearing to have a natural upturn to them that tends to give her a pleasant expression by default.

Just returned from a long-arse dormancy and realized that my ability to write descriptions was non-existent when I was younger. I nearly gave myself a heart attack from shame, it was that bad. In any such case, it has been redone and I would appreciate all critiques regarding word choice and sentence structure!

That is beautiful. Wonderful choice of wording. Nicely conveyed, nothing thrown in your face (like a definite emotion). If anything, my only issue with it is that for a character of mine, it would be too pretty. >.<

I agree, beautiful! My only suggestion is to do something else with "porcelain-esque". It gives me the image that you couldn't find a better word, so tried to make your own (I do this all the time in my normal speech). Maybe something about your appearance being "like porcelain" might be put somewhere instead? But really, when there's just one word that stands out as being odd, you've written a great description!

She is a regal aslaran demigoddess and has a proud yet mischevious air about her. Standing at approximately 6'11", she is a fine feline specimen, although hints of her mixed ancestry can be seen throughout her features. Her mid-length midnight fur is decorated with flecks of blue, while an attractive mane of pure onyx cascades down, stopping mid-back, her bangs tucked up and pinned. Large ears crest the top of her head, built for keen hearing as opposed to overall beauty. A canine-like snout, set just below violet eyes streaked with ice, slopes into a distinctly feline nose, as lips painted with a faint red open to reveal white daggers. Her whiskers are a pale blue, a tribute to her place within the water, while her inky tail features a small puff of the same hue of fur at the very end. She is chubby and yet muscular and overall well toned. Three dominant scars slice across her neck, fur missing in slivers, the marks obviously the result of the bite of a blade. The symbol of Lady Terentia, white scales formed by two interlocking swords, is branded into her skin on her right shoulder, somehow shimmering with its own light. She stands strong, with a sort of agile grace.

Her breasts are large. Mounds of her pure womanhood crest her chest, as beautiful as freshly fallen snow. Ok, so she has boobs. Fully mature, her chest features two small mounds.

while an attractive mane of pure onyx cascades down, stopping mid-back, her bangs tucked up and pinned.

Her whiskers are a pale blue, a tribute to her place within the water, while her inky tail features a small puff of the same hue of fur at the very end.