Hello everyone, I recently completed an order in which a client wanted specific illustrations for front and back cover of her book. She approached me and told me her idea and I gave her a free sketch sample to give her a picture of her ideas. She liked it and placed her order. After completing the order, she liked my work and rated me 5 star. However, afterwards we both realised that the size of the image that I sent her don't match the Standards for a paperback cover. Now I am sending her the same image in different resolutions while she is trying to adjust everything. Now, I feel really bad that my work wasn't as useful at the end, also I didn't know anything about book cover image resolutions to illustrate, so I feel a bit guilty. Can anybody tell me what exactly should have happened from the beginning so this doesn't happen?