Hey joint Im a fellow artist myself started out drawing Pac alot so I reckon I could draw him with my eyes closed.
You seem to have his features well developed especially his eye structure (eyebrows). I'm assuming you want constructive critisism so I'll give you a few things I noticed to help:
- His pupils are too big for the size of his eyes. I'd suggest making the circle inside his eye (dark part) smaller so there is more light than you have here.
- His goatee (bottom part) is to square, try gradually lightening the edges till it blends better with his chin, same with the top but thats looking good still.
- The jawline on our left seems a bit to straight for my eye, Pac does have a severe angled jaw but I think you could smoothe it out a bit more. On the other side (our right) it's the opposite, you could put less curve there. To me it looks like he has a piece of food in that side of his mouth and its making him look a lil chubby in the face.
- One last thing is that his chest looks larger than it should by the size of his face. Maybe you could try measuring how many faces is across his chest from the original pic and see if you have the same.
I hope this helps, it's coming along nicely. How long have you been drawing for? And like SiGh said, would love to see some of your other work if you have links.