One of van Gogh's most famous paintings is called simply Sunflowers; it's an oil on canvas from 1888 and is in the National Gallery in London. He painted these flowers often, so other art museums will have similar works.
Sunflowers.
He painted many flowers: Sunflowers, Irises, Daisies, Chrysantemums, and others.
Sunflowers. He also painted irises.
Vincent was a famous painter and he sent letters to his brother Theo.
by his paintings
If you mean the signaure Vincent, that is how Vincent van Gogh signed his paintings.
Because people love his paintings.
Flowers
The American painter Georgia O'Keefe is famous for her paintings of flowers.
Click link below - his most famous paintings are reproduced there.
There is no well-known still life of that exact totle. However, very famous are Vincent van Gogh's paintings of yellow sunflowers.
Georgia O'Keeffe is most famous for her paintings of flowers. Her most famous paintings show the flowers in extreme close-up view.