Delete Photos on Apple Watch

I have an Apple Watch Series 3 and I am trying to update the watchOS to 7.0. I only have 3gb of free space and I need 3.1gb. I am trying to delete photos and have already changed the photo album setting to an empty folder on my iPhone. When I go to General > About it is still showing 15 Photos. When I go to the Photo App on my watch it says No Photos. Where are these photos and how do I delete them?