This reminds me of the difference between 1997 CG Jabba and 2004 CG Jabba... more detail and definition added to make it seem more real.
We never see closeups of Ponda Boba's hands before, but you imagine he wouldn't have perfectly immaculate hands. Scars, wrinkles and that sort of thing are perfectly in keeping with his personality. I think a little more shaping of the flipper to make it more shaped like a hand would go even further. The details added thus far are a definite improvement.
A little more weathering, pores, small hairs, etc. would help get rid of the "rubber" look, and still preserve the fact that it's a flipper and not a human hand (but still suggest it to the audience). The scorching should be darker, right now it looks like it could just be a shadow (I realize it was just a quick PS job).
Now here is another radical suggestion... perhaps the gun itself could be modified so it looks like something that could be used by somebody with "hands" like this? I'm thinking get rid of the trigger finger guard?