Ok, Sherlock Holmes. I'll do you one better. Deduction mode ACTIVATE.

It might just be the lighting but the middle fingernail seems to be a slightly darker color than the others.

The color of her lipstick closely matches that of her hair, either a subconscious decision or something she's deliberately trying to draw attention to.

She's holding the camera with her right hand, so... right-handed.

Just at the left edge of the frame you can see a ring on her finger, maybe a wedding ring, which wouldn't surprise me given the size of her personality. Then again, there is the possibility that the photo is mirrored, which would place the ring on her right ring finger.

And finally, her pinkie fingernail is painted, it's just the angle, the incredible amount of compression artifacts, and the similarity between the color of her nail polish and her skin that gives the illusion that it's not.

As always, you see but do not observe. How's that for Sherlock Holmes?