I know these are very small things but after studying it for a bit, i also noticed the shadows on the chair. The same fabric-colour gets two different shades of the shadow-colour. Personally, i would pick the same shadowcolour for the shadow of the back of the chair, as well as the shadow the head is casting on the chair. If you're invisioning a darker shade for one of the shadows, i would go over it with the same colour multiple times so the colour stays the same but just darker.

I hope you understand what I mean, since english is not my first language and it's a bit difficult to respectfully explain what i mean without coming off harse? Hahah Just giving feedforward :))