😭😭

The shading is already pretty good, but something I think could change is the shorts and left arm. For the left shoulder area, the large dark spot in the middle kinds of looks like a dent, when I assume it's supposed to stick out. I think you should have that darker spot be more of a crescent shape rather than rounded on all sides. So the second darkest color is cutting is rounded into it from the right. Hope this makes sense..
Similar thing with the shorts, the large dark spot says big dent, I'd just put a lighter shade in that darkness where the legs would be underneath, because the legs would be sticking out somewhat. I hope this also makes sense haha.
I don't consider myself a pro but I have a decent understanding of how light works. Best thing I can recommend is to designate a spot for the light in your mind, and always be thinking of that light's line of sight