Trying to improve the proportions

Hello! I think his feet looks a little big, but it could be stylization choice. Maybe his left arm is a little off? In general, his proportions looks good. For training proportions, I would recommend not going into too much rendering details like the shadows. First, it would be best to look for the right placement and size of the ribcage, hips, head and the limbs. Then, you go for other details.
Andrew Loomis's charts are a good way to study proportions.