This is an initial concept drawing of three of the races of shark people that make up the Selachiians. I know I haven't said much of anything about them before, but I plan to upload a cool history and some more info soon, as well as more individual races, and a detail of myself (once I decide on it). I am ramping up my drawings this weekend, so expect more soon.

Please provide feedback, as I am fairly new to drawing anything living, especially with anthro features, so I'd like any suggestions/tips I can get. Thanks!

NEGA:
These curious creatures are considered to be far more physically developed than most other Selachiians. This is notable in their formation of distinct ears and more level heads with semi-rigid skeletons. (Most other Selachiians have cartilidgeous skeletons and maintain a rigid shape by way of very dense muscular systems around the cartilidge.) Negas are known for their extremely keen eyesight, hearing, and physical robustness. They are the mainstay of the Selachiian army because, though not particularly smart in comparison to some other races, the Negas are very hardy and can survive with no moisture whatsoever for days. The Negas most commonly appear as foot soldiers and some vehicle operators.

CARCHAAR:
This particular race was once made up of many different sub-groups, but has come to be known generally as the Carchaars, due to physical, cultural, and genetic similarity. They are the most common of all Selachiians, making up the majority of the civilian population. Carchaars are nearly all average in build, intelligence, and endurance, with the occassional deviant. They can be found in all walks of life, including civilian business and military positions, though their general reliance on water exposure for hydration makes them more suited for life on the planet's surface.

IISURU:
The Iisuru are an exceptionally fit people, generally considered to be the most athletic and acrobatic of all the Selachiians. They are unusually smart for their size and strength, though are quite violent and were the instigators of many conflicts before the unification. The Iisuru were once known for their body markings, or tattoos, though they have now brought this cultural feature to the rest of the Selachiians. Tattoos are now very commonly seen on all races, indicating anything from marital status, to military rank, as jewelry and insignia on clothing are never used. Iisuru can be found throughout the Selachiian world, and commonly serve in the military as scouts, or in any position that requires prolonged exertion.

Edit: I noticed a gill had disappeared when I ran the cutout filter in PS, so I replaced it.