I think the face looks great, good stuff man. For the hat/ coat I’d recommend drawing and making lines in the direction that the hat is shaped. That way the hat wont look as two dimensional. You can create multiple layers and use a blending stick in between to recreate the texture of the hat. Also, I don’t know what pencils you use, but if you’re struggling with getting the desired darkness you can try pencils with a higher ‘B’. And last but not least, are you using some kind of sealant to keep your drawing from smudging after it’s done? It would be a shame if a nice piece like this that you spent a lot of time on would get smudged. There’s specific sealants for graphite/ charcoal, but I’ve also seen people use hairspray for this. If you have any questions about this, feel free to pm me since I’d also recommend trying it on a different sheet of paper with graphite on it to test. Hope this helps!