Love the idea, and he’s coming along nicely. But there are a few tricky areas…
I think the curved folds above his eyes are bothering me. They feel out of focus, if that makes any sense. It’s not clear whether those are rigid or fleshy?
The overlapping wrinkles and ridges under his eyes threw me off in the earlier draft, but are less evident now. Like, I think you’ve got folds of loose flesh pulled taut over cartilidge; mixed signals of stress and release. Maybe the overall form of his eyelid should be broken up between ridges, like the material of an umbrella or a bat’s wings? Not sure.
And finally, I think less symmetry will improve realism tremendously. A few miscolored splotches here and there should go a long way…