Anybody know anything about selling art?

My mom died a few years ago, and her partner just moved out of my house. I’m clearing it out. They took a lot of cruises and liked going to the art auctions and buying art. They didn’t go crazy—they spent anywhere between $200 to $1500 a piece. They’re pleasant to look at and nicely framed but I have zero room in my house.

Do you know of a place that will do accurate appraisals and somewhere to sell? I’d rather not dive down the ebay hole if I don’t have to, but I will. Some of these have certificates and some do not.