How can I find out about my black velvet oil painting

Thousands of them are made every year. One in a million might be worth something, if it's old enough.
I doubt that you will find out where it was made (often Mexico), but you can try.
Some sell for kitsch value for about $100, tops.
Try this museum: The World's Most Obsessed Velvet Art Collectors Want You to See the Light at Velveteria in Chinatown | L.A. Weekly

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