I would double check your proportions. I am struggling with that too so I understand. If you take a ruler to the original photo and look at the head size compared to the rest of the body and then look at your drawing, I think you will see what I am talking about. Drawing the too big or too small is very common. I've done both multiple times.

Nice job Dennis! I think the biggest critique I could give to you right now would be to keep working on your gestures. This figure feels a little stiff and that's probably because you were focused on getting the proportions right.