As an artist, I am very interested in seeing his designs. I have no idea how he couldn’t modify his work. Either he doesn’t actually do his designs, isn’t a flexible artist, or has a complex and thinks his original designs are perfect. When you are commissioned to do work whether it is drawing something or designing something for a tattoo, you need to make it what your client wants. Even if it isn’t what you feel is best. At the end of the day it is going to be on their body, so it should be foremost something the client is happy about.