This one may not look like it, but I broke one of my longest-standing rules.  I never alter the clip art except to flip it or resize it.  In this case, the original clip art had drawn the shark with a cartoony eye.  It was looking back at the diver like a human eye, complete with eyebrow, making it look annoyed.  That would have ruined the gag, so I fixed it to look more dead-ish like a real shark eye.