Yeah, I know about clicking outside the photo, it's just that I am on the computer too much and the less mouse moving/clicking the better for my wrist. Usually when I enlarge a photo my mouse will end up hovering over it without moving it, so I could just click to close. Seems trivial, I know.
I don't have Paint because it is a Windows program and I use the operating system that Dave uses, Linux, hence I use Gimp. We are a rare breed, not a whole lot of Linux users out there. But I will get it figured out, I just need to spend some time on it!