still: a static photograph (especially one taken from a movie and used for advertising purposes)
photograph: a representation of a person or scene in the form of a print or transparent slide; recorded by a camera on light-sensitive material
nitroglycerin: a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat)