Very cute. I didn't want to review all of your work but this piece is particularly compelling. In its uncolored state it's a little hard to distinguish what exactly is going on with the gag, but otherwise this is pretty clear. The hairclips look a little unnatural to me, and her left shoulder is raised up a bit too much (either that or it's too large.) Also her hips, while completely fine for someone a bit older, seem a little wide given the age implied by her face.
Aside from these (tiny) nitpicks this looks damn good. I would love to see more shading similar to the neck, as I'm a huge sucker for dramatic lighting, and this could of course be colored, but as a work in progress this looks outstanding.