Sun with face gives the sun a bright, sometimes intense cartoon expression — used for 'blazing hot day' captions or, playfully, for someone being a bit 'extra' with sunny energy. Along with the moon faces, it's a holdover from an era of emoji design that favored anthropomorphized celestial bodies, a style rarely repeated in later additions.
Keywords: beach, bright, day, face, heat, shine, sun, sunny, sunshine, weather