Vincent Van Gogh, one of the greatest artists who ever lived, on earth at least. The Doctor would say it’s an honour to meet him, if the man was friendlier, but he supposes being down on his luck and unable to afford a drink is making Vincent cranky.
Even to anyone who doesn’t know it’s obvious the man is an artist. There are paint spatters on his clothes and hands; the painting he’s holding is a dead giveaway too. Not that anyone seems impressed by it, except the Doctor and Amy.
Great artists are seldom appreciated until it’s too late.