I am a freelance artist and a client ordered 3 illustrations for his online web presence. I charged 325.00 I completed two drawings and he hated them. they look like him, they are quality but he is just unhappy and wants me to refund 225. I did 20 hours of work for him after considering tons of notes from him. I offered $125 and he is holding steadfast at demanding $225. How can i protect myself against hi filing a claim. I have tons of screengrabs of the work completed and I don't know what to do?