Finished version of the sahagin, turned out fairly well if I do say so myself. Was a little difficult to color, however, considering I can only find 2 of my pencils: a blue and a green. Well, I guess that's what happens when you don't use them for a year or two....

I really liked drawing this guy, might be tempted to do more like him in the future.

Male Sahagin, approximately 6'4" (measured to top of head, fin-thingy adds another 1-2 feet). Sahagin are omnivorous, and largely act as scavengers - their jaws, lacking the sharp teeth present on more predatory animals, are perfect for cracking shellfish. They are naturally covered in a thick, platy chitin, however, in areas requiring more flexibility (fins, tail, legs & hands), the chitin gives way to dark, leathery flesh. The talons on the hand (3 for males, 4 for females) are sharp, but not usually used for hunting or combat; Rather, they perfectly evolved for cutting edible plants like scythes and digging up burrowing creatures. Males have larger, thicker "fingers" in order facilitate the gathering of food, while females have thinner, more dexterous digits for fine manipulation.
Should the need advise for a sahagin to defend itself, it may use its hands or beak to attack, however, its preferred weapon are the talons on its feet: they can curl together, like a raptor's, and their grip is incredibly strong. Sahagin can also use their feet to snatch fish out of the water.
A sahagin's primary method of propulsion is the frill running down its back. Each "spine" is actually a large, muscled mass which it can undulate rapidly, permitting it to propel itself at great speeds through the water. The fins on its hands and tail are used for maneuvering and can be used with great finesse - the creature being unable to see behind it at all, has learned how to spin around easily using these fins, even when traveling at high speeds.
Out of the water, a sahagin loses much of its natural grace - being unused to using its legs for propulsion, its movement is often jerky and gait uneven.
Coloration is usually a result of diet and water conditions, as such, while there is great variation in their color as a species, all they sahagin living in a given clime usually have similar colors.