This is very well done. The face and anatomy look amazing!!
But, I do have a comment that is similar to my comment about the other image you did with the guy sitting down in the city. It's regarding focal point and controlling your audience to look where you want them to. In that last image (with the guy sitting), I mentioned that his foot was a literal block for the viewer to enter the picture. It became an unintended focal point. In this one, the sleeve he is wearing on his arm draws a massive amount of attention to his forearm. I'm pretty sure you don't want the viewer looking at his forearm when his face is SO AWESOMELY PAINTED!
The reason his arm stands out is just due to it's high value. The solution is to simply remove it. I know he wears it in real life and you are being true to that. But this is the reason clients hire illustrators and not photographers. We can choose what we include and what we don't.
Here's a sample where I just copied the other arm you painted and flopped it. Now look how much more focus his face has. At some point I think it needs a bit of color too. But thats for later.
As always, take what you want from this suggestion (including doing nothing at all). It's just what I would recommend. I'd love to hear what others think.
Great work. It's cool seeing your process and you are quite a skilled painter!
