"This has happened to me a few times. I successfully handled it by conducting a work session with the designer to understand where they were coming from. Their concern was that the work was inadequate in their eyes and not representative of our quality of work. I let them know that I agree about the quality. I then continued to explain that if we aim for perfection, we wouldn't only miss the deadline, we would also incur costs we couldn't afford at the time. So, we reached a middle ground where we would get the deliverable to at least 60% of the designer's usual quality and set a hard deadline. We still went past the due date, but only by two days."