I like the overall design and the coloring is beautiful, the only thing that throws me is the mouth. Admittedly this is more a point of preference but the mouth looks really reptilian (or eel like) while the body a crustacean and it creates a bit of biological dissonance in my mind. Overall beautiful piece.
The design of the creature is very nice, but the preview of it tells me it's about the same size as a lighter. There is no water between it and viewer or any similar effects to give viewer any sense of how large this creature is.