The sunglasses look crooked, the far side is too low, it should probably be about the same height across the face.
His far cheek sticks out too far for someone with such pronounced cheekbones. It'd probably help a lot to pull it in a few pixels from where the cheekbone ends to the bottom of the jaw.
His hairline looks like it's receding, you could bring it down quite a bit.
The shirt and neck aren't very well done compared to the face.
I think there might be a bit too much AA on the nose.
Other than that, it's looking pretty good!