Imo...you should put a little but more loops on the fins etc as it is having silhouette issues...meaning when you render there will be dark spots that will affect the look of the model.
This was all done for a school project where we team up and make a game prototype. I did the orange fish (and animation) and other characters and backdrop were by my teammates.
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Kick the penguin!
Character Render:
Texture Maps:
Unwrap
Diffuse
Specular
Normals
Opacity
Self-Illumination
Ingame mockup:
Concept Art compilation:
Just posting my stuff for now. If anyone wants I can post the stuff that my teammates did.