The body shape screams mech-otter in feral mode. The head shape seems to be going for a more skeletal/skull like view and for a sea otter its almost spot on.
The only thing that pushes it slightly towards river otter is the jaw length; sea boys jaw's are ~just~ under half the skull length. The drop off for the nose could be lessened too as sea otters basically have a big ol' rectangular box for a skull with eye sockets basically in line with the nose. But from a design+practicality point of view as a piloted mech it may not make too much sense to have it that way.
