I want to express my deepest gratitude for your business. I'm honored to have been selected to serve your business with professional copywriting services.
As you may know, I'm always studying the copywriting craft and striving to improve the service I provide my customers.
Won't you take a quick minute or two to provide me with some feedback on the project we recently completed?
I'll read every word of your feedback, and please know that I'm sincerely grateful for your thoughts.