How do I delete photos from my drive on iphone v 8.3? They are not showing up in iCloud

When I am sending an email and I click the "attachment" paperclip, one of the options is to insert from "my drive'.

When I click on "my drive" there are 2 photos in there that do not show up in my iCloud account and I want to delete them.

How do I do this?

Iphone 5S, IOS 8.3, Gmail app

Thanks in advance!