How to add FREE images and photos from the internet
This is probably the best place to start. You will find diagrams as well as photos and art. And everything is free.
You need to know 2 things.
1) If it says Public Domain, it is free from copyright and safe to use
2) If it says Creative Commons, it means you have to acknowledge the photographer/artist on the same page you use it (also called Attribution), but it is still free to use.
Paintings are a great way to illustrate the pages and nearly all will be free to use. I have put one from Wikimedia in the Breastfeeding categories page - brightens it up nicely. I hope to add pictures or photographs to ALL our pages.
How to do it:
Download>Full Resolution>Right click and Save Image (or whatever you normally do to your computer)
Upload as usual.
(NB "Use This File On A Wiki" icon gives you the shortcut link for your page you are editing)
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These are some of the sites I recommend for free photos to use with the wiki. I have chosen those that you can go straight in and download from - a lot of others want you to register and all sorts, so these below are nice and easy and free from all that nonsense.
http://www.photogen.com/ (very limited stock, but easy to download etc)
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And here are a few that you must sign up for, but are still free and easy to use