OK so this is like my 3rd/4th piece in charcoal and I'm pretty happy with the way it turned out, but I'm still not completely comfortable in the medium since I kind of just... figured it out and never learned the finer points to using charcoal.

i really like the way his hair looks, very soft and yet well-detailed toward the front to frame his face. the lighting here is really nice. strong shadow level differences and texture to draw the eye. most of what's on his head/face looks great

i'd suggest trying to put more contrast in the eye tho, it seems a little dull compared to the area around it. the suit also seems.... smudgy i guess? it's got lots of medium grays and everything blends together. it makes an obvious and kind of jarring difference between the face and everything else. o:

of course lower light and less detail works for the unimportant areas farther away from the light source, but erasing some stronger highlights into the front of his collar, hand/arm, and the sextant could help it feel more unified. you might also darken those grays a bit toward the bottom right, to take some focus off of that area

basically, the face, arm, and sextant are important. put the most contrast and detail into those areas! or i guess rather, put contrast and detail into the second two so they're more consistent with the face c: