Looking at it roughly, i really like your shading and lighting!
There are somethings i'd point out such as:
- the right (his right, our left) hand i think is a little smol..
- i think his right/our left shoulder might be a bit low based on where the other head and shoulder are. might wanna tilt the head down a bit
- from afar you cant rly see the details of his eyes so i'd recommend using more contrasting colors - on the color wheel pick the main color for ur eye. then move the color darker (like ever so slightly to the green or to the red, while the color remains in place, then drag the color down diagnolally on ur screen by about 1-1.5 cm so the contrast isnt too wide)
- i think putting some reflective highlights in the eye would look good too...
That gets me something like this, where you can still the eye detail you worked hard to put in, from afar
I'll do a rendering of my points later :3 since i dont have as much time rn but hope that makes sense!