Be careful when buying art.
These days, it can be difficult to tell online whether you are getting truly original art or a copy put out by a machine. Some copies are printed on canvas and a dishonest seller could convince you that you are buying an original. It’s a good idea to be careful when buying art, whether online or in a physical gallery. Of course, reproductions are fine, as long as you know you’re getting a reproduction from an honest seller. I say “honest,” because some sellers will illegally make reproductions of another artist’s work, then try to sell it to you. This is why many artists will not publish large images of their art on web pages. They are afraid of theft.
Below is a closeup of one of my oil paintings. It’s not the best image, and it is, after all, only an image (not the original), so bear that in mind. I am trying to let you see the texture of the painting.

Okay, just for fun, here’s another:
