The Koran doesn't make a direct quote saying that pictures are not allowed, but idolatry in not, and if a picture was painted of the prophet, or made of the prophet, then this would be a form of idolatry.

124

The majority of Muslims, while they're writing letters, while they're making phone calls to those papers, while they're boycotting, they're not inflicting violence on people who have nothing to do with this.

95