I feel like it's looking quite cartoony right now. Mostly in the anatomy of the creature, it feels like the feet should be bigger and that the top of the legs should attach to the spine better or more smoothly. I think you should get away from any kind of shiny material when sculpting this, just try to define shapes more…
Added the scales and other small details using alphas, layers and morph targets, I'm thinking of dialling them back though as the muscle definition is getting a bit lost. High res renders below, feedback welcome and appreciated :)