I'm rather proud of the hair and most of the body, but how the heck do you do lighting, lips, noses, etc?? (The pink is a scribble of where I think the lighting would be, but I'm rather clueless on technique.)
The sharply-contoured shadows in the scene strongly suggest that there is a single, point-shaped source of light. Most of the light effects currently shown suggest that it is off to the right¹ of the scene, pretty much sitting
on the wall (if it extends straight to the right¹), somewhere around shoulder/head height of a
standing person.
First off, note that that's a lighting that a
photographer would
hate (in RL, it would produce deep shadows on the left¹ wall and the left¹ half of the chair and the person portrayed) and insist on changing. For a painting, I guess it's up to the artist to decide whether they want to do "a RL scene" (with a lighting that never was meant for more than allowing the person in the armchair to read a book) or one with "artist arranged" lighting.
Having that said, the effects most clearly contradicting the light source as described in the first paragraph are the shadow of the head (should be on the
left¹ wall), the highlight on her right² leg (should be on our right¹, rather than the left¹, or possibly only on her
upper leg, as the armrest might block it from the lower leg), and the lower-right¹ edge of the chair's shadow (it extends to the floor
in front of the chair, which would require the light source to be
above the chair, rather than off the right of the scene).
In addition, the shadows underneath the chair look like the chair's and the person's
superimposed. In reality, the shadow of the (intransparent and closer to the ground) armchair should remain the same whether there's a person sitting on it or not; the person's shadow would only show
around the chair's.
Last not least, what jumped out to me
first were
not the inconsistencies in the lighting but that there's no way that a normal human arm could connect left² shoulder and left² hand and still stay
entirely out of our view. Even if the left² armrest had a cut-out to permit the arm to pass
"through" it at the shoulder, the arm would have to be about twice as long as the other to run unseen to the wrist and allow the hand's position.
Edit to clarify: "Left" and "right" as seen
¹ from
our POV,
² from the chair's / portrayed person's.
