Do some extra work and tell the client that you do this as a gift if possible. And before delivery ask the client Do they are satisfied with your work?
Follow this and Ignore No.5
https://community.fiverr.com/forums/topic/282146-how-to-be-successful-on-fiverr-common-questions-answered-and-a-collection-of-great-posts-that-helped-me-achieve-trs/