What's the difference between a photograph and a painting? In these cases, it's nearly impossible to tell!
"Mona Lisa"
This photograph of a woman slowly morphing into a lizard isn't that at all! It turns out it's a painting of a woman slowly transforming into a lizard mutant!
"Starry Night"
Though it looks like a photographer managed to capture this moment of the Grinch juggling a bunch of eggs, it turns out that a painter managed to capture this moment of the Grinch juggling a bunch of eggs!
"The Persistence of Memory"
At first glance, this appears to be a backstage photo of Pamela Anderson and the rest of the cast of Baywatch, but this is actually a backstage painting of Pamela and the cast.
"Scream"
This screengrab of Macaulay Culkin from the 1990 film "Home Alone" is actually a painting of Alex D. Linz, from the 1997 film "Home Alone 3!"
"Crying Woman"
This is a painting!
UPDATED: This originally made this list as a painting. However, it has come to my attention that this is quite obviously a photograph of a black stapler falling off of a high shelf.