The shark I believe is a character from the Street Sharks show that was popular in the 90's I think.
The black Halloween mask in the bottom of the first post looks like Venom, originally Spiderman's black costume in the 80's, which turned out to be an alien creature that started to take over Peter Parker's mind. He eventually managed to separate himself from it, and it hated him for it. It then found a new host, a rival photographer named Eddie Brock, who also hated Peter Parker. The story has changed a lot over the years, but that was his original origin.
Def