I keep finding myself comming back to this peice, which is a very good thing. It means it’s making me think, whether or not you wanted to provoke that, you’ve done it. Which for that you are to be commended.
A good idea when wanting to provoke emotion, is to put yourself in that position, physically and mentally. Think those thoughts yourself, hold your body in the manner in which your character is to be posed.
Does it feel natural? Does it fit with what your thinking? What feels awkward?
I have just done so for your character. I found myself doing a few things that I think would work really great with your character here.
As we’ve already spoken about, the head should be titled slightly forward, to enhance the feeling that her head is resting on her hand. And if her hand is holding the weight of her head, you should kink the wrist slightly, and tense the veins in the wrist.
Also, in terms of the hair. I would think that if one was in deep thought, with their mind processing information, good or bad, fast or slow… one would want to be comfortable. Does the hair hanging down in her face look comfortable to you? I’m sure it wouldn’t be.
I’d find myself brushing my hair back behind my ear on the left, especially if my head was tilted towards my hand on the right. It’s never comfortable to have hair slapped against your face like that. It also implies a nervouseness about her, whether or not you want to provoke this or not is your choice. But I feel it would fit pretty well.
Her mouth is also open, she appears to be taking shallow breathes through pursed lips, which would tend to dry the lips out. Although these sound like stupid little details, they are these details which totally enhance emotion within an artwork and instead of the viewer looking for the emotion, your going to give it to them, force them to feel what you want them to feel when they view your piece. Those little details make the emotion powerfull, to the point that it cannot be denied.
Another question for you. Is she daydreaming? Or in deep concentration? These details are important to show in order to carry the emotion across correctly.
If she is in deep concentration, tossing and turning ideas over in her head, tilter the browline down just a little where the brows meet in the middle. This will help carry that through.