Quite a few photos include "Wallpaper" or "Public Domain" in the name: this is a good way to attract broader searches, and is reassuring for those who don't want to waste their time on spam/porn.

So, "(Wallpaper Public Domain) Grand Canyon.jpg"

Searches also look at the folder name (path) in which the files are stored. So you can add some "invisible" ways to have your photos show up in other people's searches.

However, pleeeease don't put them in a folder called "Britney"


btw--many home digital photos use the camera's default naming, so if I'm looking for non-commercial photos, I just search for "dscf .jpg".