In 1986.
Leonardo did not 'paint' it. This was one of his many drawings, and it could have simply been because he had red chalk on hand when he decided to sketch out this self portrait.
Most art stores will be able to source Andy Warhol prints. However they can be easily purchased on line from websites including Art, All Posters and Art Republic. Red Bubble can even offer t-shirts and handkerchiefs with the famous images on them.
The one in red crayon, now in Turin, was made in the 1510's.
Because he wanted some red paint for his self-portrait.
The red triangle was imbedded in the portrait 'Geometry of Red Triangle' by Pisarev Gennadiy.
Andy Warhol is probably the most famous pop artist. Some other famous pop artists include Roy Lichtenstein, Richard Hamilton, Peter Max, Red Grooms, and Ed Ruscha.
Red was a con. Andy was the wife killing banker, the smart one.
Red had been in prison for 20 years before Andy arrived.
Andy became friends with Red because he wanted a rock hammer, an outside product which Red could get through connections.
They first have a conversation in the courtyard where Red and Heywood are playing catch. Andy came to Red to ask for a rock hammer.
A rock hammer upon Andy's his own request.
Henri Matisse is known for his painting "Woman with a Red Scarf."