An upper eyelid is typically considered more attractive by most people if it lacks excessive skin and fat, possesses a reasonably defined crease (which makes the eye appear bigger--a universal signal of youth and attention), and displays at least some platform of exposed skin between the crease and the eyelashes (which, in ladies, allows for a more effective application of makeup).
A well-contoured lower eyelid free of bulging fat projects an image of youth, energy, and rest.