I'm wondering if maybe the teeth need to be brightened up on this? Because while I'm fine with the open mouthed expression, in most of the lighting I've seen it under it's usually hard to make out those teeth, which just makes the expression look a bit odd, and more like she's blowing someone a kiss. And even under direct lighting they don't seem quite as bright as they should be, and the lines between the teeth a bit too dark.
IMO I wouldn't touch the teeth, I like the tint it blends with the lipstick just right, the teeth accent the lips perfectly ..Just my opinion
I don't mind making my figure's hair look like a Tresame ad. It works