Hello Sir/Madam.
I know this request might seems too much but I need 2 more days to finish my work and it's because I'm doing my work in 3D not 2D and it takes longer to be completed. I have worked past 3 days non stop and I'm making 3 mascots for you. It will be such a waste if I can't show them to you, I think they look very good and you'll probably be interested.

Hi Wayne, it's two hours remain to deadline finish and I guess you decide don't wait anymore, I respect that and I really grateful for the first time you extend the deadline and truly sorry I couldn't deliver my designs to the determined deadline.