To me it's not the fact that she's lighter than everyone else(maybe she just started going to the beach), it's hard to see much detail due to the distance she's been posed from the camera. Also another thing that makes her look out of place is the fact that she too sharp when compared to not only the guys close to her but also the sand and the shell,rock or peice of paper that in the image is closer than she is seems to be blurred more than her.

Had to edit when I reread that it wasn't a skin shader but shaders used for scenes. Please disregard the part about not seeing enough detail of her skin.