I love this idea and I love where it's going. It is very difficult for me to tell where the actual primary light is coming from. It seems as if you are trying to make him his own source of light, since he's a deep sea creature--kind of like the lantern fish, if that's what they're called. But his whole body is very light with a lot of specular light all over. It doesn't feel as if he himself is glowing in the way I feel as if you're trying to portray him.
The part that looks most realistically glowing is his tail. I believe this is because that golden light is reflected off of the nearby fin bones. Whereas, a lot of the specular on his body is a pinkish light--it doesn't feel as if it is properly placed.
I'm admiring this creature right off the spot! The anatomy and how you're showing its sinews makes this beast eye candy to me.
The only critique I would like to give to you is its light sources. I do see the glossiness on its muscles, but the shine on them seems too much, unless there's a light shining on it from the camera's point of view. If there's no light coming from the first perspective, then darken up the shine on the upper body just a bit because the glow coming from the front fins can't generate enough light to make the muscles there shine that much.
The fins and the hind legs are OK, since there's more glow coming from the tail fins.