I am an amateur/hobbyist photographer. An "artistic consultant" recently saw a few of my photos while working for our company and has a client that would love one of my shots for a specific piece they are doing. specifically they want to print it on a piece of metal--that would hide all of my amateur mistakes, I hope. She wants to know how much I would charge for a "one time usage." I am clueless and do not want to be taken advantage of.