I started overpainting this sometime ago, then you posted, then I was thinking about scrapping it... but whatever, i'll go ahead and continue on and give the advice I was going to give. Otherwise it would've been a waste of time.
My advice would be to increase the fill light in the background, making the light spread around back there a lot more. This'll create more contrast with the shapes in the foreground as a whole. Secondly, lower the values in the hair shadows a lot (which i noticed you did a little in the updated one) but you didn't really do it much around the neck area, which should be the darkest part of the hair because it's getting the least amount of light.
Thirdly, be very careful with that saturated green lighting you put in in the bottom right. Their's two problems with lighting that is highly saturated, 1) as light gets brighter it tends to lose saturation, which means there is a lot of difficulty in trying to make lighting look natural and not artificial 2) saturated colors tend to have a way of drawing attention to themselves, which can create complications with composition and eyeflows. That's my opinion on it.
Fourthly, i was going to suggest to brighten up the curtains and increase the saturation a lot, and toss a hand shadow underneath. This'll create that transmitted lighting effect. You know when the sun shines through semitransparent material like green and yellow leaves? Or perhaps a balloon, umbrella, or stained glass. That's what is known as transmitted light, and the colors become richer. Though it does look like you scrapped the curtains completely updated version =\
Anyway, that's my advice. Good job on the piece.
