It looks good indeed, but I think you can make it even better. If the frog has a UV map, I'd make a black-white mask off that, painting just the eyes black, the rest white (or vice-versa). Use that mask to add a little more very fine displacement/bump to the skin. I can tell you how, if needed. Then also change the refraction size a bit (to maybe 1.8 ) and the roughness of the reflection to a lower value, say 0.15 -0.2 (guessing now). I think it's a little too soft atm.
The frog would also be a wonderful object to add subsurface scattering to, by way of feeding the colors and displacements into a glass shader's color and density inputs. There are threads covering this method.