Wonderful piece, as usual from you
Your sense of volume and composition and dramatic storytelling is great. The composition works perfectly, it is very dynamic. It reminds me a bit of some of Frazetta's paintings - maybe you could look up his monster pieces. I have always loved the way he left some parts unfinished and detailed only the focus point - this approach could work very well here.
The only thing I would reconsider are the fishes - they are spaced too evenly, like a pattern, and their straight horizontal arrangement kills the action a bit. I do think you need something there, so maybe just group them differently and add a slight angle?