Hey, there are a couple of mistakes that I can notice for first. Like the forehead seems very flat. Also the upper eyelids are completely gone where they are going outwards.Dunno how to explain it well, sorry, I'm not so perfect in this topic I just never saw a this kind of upper eyelids even on a very old man. That "line kind" of eyelid shape shouldn't be completely gone under some hanging skin or something. The area above the upper lip seems too high to me, and the area between the cheek and the lower lip seems no small. So mainly I see some proportion issues, but once again, probably I'm not the best guy to ask.
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(I think this gold matcap make visible more detail.)
And i see this eye thing on this man:
So what du u think now?