The expression is wonderful, but it's the makeup texturing that I find stunning. I've tried to get a near-white skin shade before and failed miserably. It either looked grey and dull or too bright and white. But yours .. wow! Those subtle wrinkles and pores and just a hint of skin showing through around the nose. Respect!
I like it, I like the facial expression, the texture and the fact that it's not the long face joker we're use to see in the comics.
Suggestions: I think the piece would gain ALOT if you would work on the lighting. Right now it,s almost flat lighting. Something with more contrasted shadow and bright areas. And if you don't want to tinker with lighting , just playing with photoshop a bit would probably do the job.
Also, it's a miner detail, but the shape of the hairs on the upper left side look squary a bit, like if he just got out of bed or something. I think it should be rounded to follow the head shape....
This is a really fine model. I love the lighting and the detail around the eyes and nose is really impressive. Just one thing, I would personally make the chin a bit longer (but thats just my himble opinion). Excellent work.