The art advisor takes a 20% commission, which she said will be split with the interior designer. I was under the impression there would be no further markup, and my invoice would go to the client--but who knows? The bottom line for me is the net amount I receive, but I'm trying to sell at consistent prices. The galleries I've worked with take a 20-50% commission, so this is a good deal. The art advisor seems like a nice person who genuinely likes my work, so I'd like to be considered as easy to work with, and not make things too complicated.