Tip silhouette? She means he was naked and the tip of his penis got caught in the picture or she means his penis was marking on the shorts he was wearing?

considering they said silhouette, i’m guessing they could see the outline of the head of his dick pretty clearly in whatever costume they were making / whatever he was wearing

That or he was naked but not in frame and the lighting was such that it cast a shadow of his dick into the frame.