We have a policy that when a customer picks up the finished job and inspects it we have them sign the bottom of the invoice. This tells us that they have agreed that the framing is correct and of course looks great! What we haven't done is put a disclaimer about damaged originals works of art. Recently a customer picked up her framed oil painting. She called the next day to say we had scratched the center of the oil. All four of us at the gallery are sure it did not happen at our shop. I am still waiting for her to bring it back for me to see. She wants to send it back to the Artist for repair. I do not know yet what we will agree to. I know I will be asking the value of any original art at the time we take the framing order and now will have that signed too.