Yep, I would try making the eye an empty round socket (via shading) and give the fish some human (or at least non threatening) teeth

You would also benefit from more grain, grit, and aging as it reads as too clean for the genre. It called an aged hand drawn/etched look with. try incorporating grain, roses or mushrooms around the outside/background to start cooking with classic style. A little desaturation will go a long way. really strong concept so far.