Nice! Very impressive work. However there was something bothering me when I first looked at it. Here’s what I can come up with:
The shadows on his face (below the mask) kinda gives the illusion that his face is “punched in” or that he has no nose and no cheekbones behind the mask. Makes it look like an old man with no teeth because the side of the lips seems to bend into his face (I’m not sure I’m explaining correctly, my english isn’t very good, sorry) It also produces the illusion that there is like an inch of space between the face itself and the mask which looks strange because the eyes give the impression that there is no space at all.
And to nitpick a bit more, although it already looks great, the face could use a bit more very soft light at the right define the shape and to separate it from the black background. It seems completely black and accentuates the illusion I was describing (or trying to) before. Not lite directly, but coming from behind the shoulder would look nice I think. It wouldn’t look out of place since his shoulder already looks like it is back lite with blue light.
Also, if you placed the camera lower it would make him look taller and much more imposing. Or maybe changing the lens to a lower setting and placing the camera closer would do the trick.
Hope that helps! Your modeling seems perfect to me, especially the suit itself. I love your work.