Restaurant Work

A restaurant has contacted me saying that they like the work I have posted on my Instagram page and have asked if I would like to display them in the restaurant with prices on them to try and sell them, all they have asked for in return is that if I do sell any they would take a small percentage. I told them that I would love to have the opportunity to display my work in the restaurant and below are the paintings that will be displayed, the next thing I need to do is figure out how much I should price the paintings at.