I like the color contrast and the happiness in the photo.
The lighting is interesting and flattering.
This photo has a cool background and a clear message.
WORST:
This is an unflattering angle (although finding a flattering photo is hopeless in the case of this model. @rachelcphotos.) (Just kidding.)
The subject does not fit in the screen and the background is cluttered.
The light writing is sloppy.