A female who takes a large amount of different pictures of ones self until she's found the correct one. Once found, the pictwhore will then put it onto her computer and use some form of editing, completely changing the picture and eliminating any imperfections, essentially making herself look attractive, which she is not in reality.
Guy #1: Look at how hot this girl is dude!
Guy #2: No man, she's a total pictwhore. Have you seen her in real life?