As a painter selling in Catawiki I have to say thet the experience is not good at all. You are completely under the will of the experts wich sometimes accept your work (mostly not) without any criteria. Impossible to contact them unless you submit another time to receive the automatic answer. It doesn't matter if you try to ask something politely. They don't answer. Mostly they tell you to read the submission headlines. I do it over and over again and I find nothing wrong about my art. But... When you sell they really make money out of you. They should treat sellers better. For example: The one with the ducks was aproved and sold. The one with the dog is impossible to get it aproved... ¿Why?