sneer, squint, glance, skew, twire, undress with one's eyes, side-eye, sideglance, lewd, give someone the eye, more...

ogle

civil, evil, cunning, ugly, triumphant, drunken, roguish, wicked, hideous, jealous, sly

evil grin,   creepy smile,   lascivious look,   suspicious look,   sexy smile,   eye rakishly,   look like a creep,   smile evilly,   unnatural grimace,   look suspiciously