Where to sell paintings online?

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I love to paint watercolors, but rarely have the time. I heard about some websites where you can list your art for sale, does anyone know more about that?I mostly paint the faces and scenes from here in Guatemala. The indiginous are very brightly dressed people with expressive faces and it is a lot of fun to paint them. I´m still not an expert, but I would like to see if there is a market for my stuff out there.:)