I wouldn't throw it out of bed.
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The hair looks a little off, as if it's something you normally have trouble with, otherwise it's not half bad. Hat syndrome sucks lulz /artnerd
Junpei - measure every body part by the number of "heads". Map out the placement of limbs, facial features, hands, hair, ears,...etc. even t-shirt graphics before laying any hard lines down. Use a soft pencil or stick charcoal.
Another technique is to lay in all the shadows first (This would work better than just oulining areas of shadows and filling them in), then pick up (use an eraser) any highlighted areas. For example, the camera , purse, and even the tops of her hands/fingers would probably be better rendered in this fashion.
Also, the graphics on her T-shirt are too distracting. Although they ARE black in the photograph, just create an outline or simple/quick figure sketch of them in the drawing so they don't take the attention away from the main subject (in this case - cloudwalking).
