Oleographs are pictures that are printed on special paper to make them look like paintings.
Oleographs are usually considered to be very beautiful and valuable.
Examples:
She has a collection of oleographs in her living room.
The museum has an exhibit of old oleographs.
He bought an oleograph of a famous painting.
The oleograph looks so real, I thought it was a painting!
The oleograph was so pretty, it looked like a real painting.
I saw an oleograph of a flower, and it looked like it was alive.