I'll try to be lenient, but here are some basic rules:
1. Nothing sexual, just cute kids being cute. If it was taken with an innocent purpose in mind, then it's probably allowed, if not then probably not. This means no nonude models, no nudity. If you have any questions concerning what's allowed vs. what's not, just ask.
2. No hotlinking, use hxxp:// or htp://, etc.
3. Absolutely no linking to someone’s private photo albums, instead upload to one of these hosts:
imagebam.com
imagevenue.com
and many more that I can’t be bothered to remember