If anyone out there recognizes it, please let me know so I can properly credit it.
It's she cool? Flirty and kind of sexy. The way the warm color of the skin, face and hair contrast with the cool green of her costume, the floor, and her exercise equipment is just great. The flat colors are a popular approach right now, and the shadows and perspective give it depth.
Update… The ever-amazing Stan went sleuthing and found a bigger version of the image, which is even better:
We're still not entirely sure who created the image, but the big version is being hosted here.