Not all places can get shiny counting buttons yet, but there are a few different solutions to allow people to flattr your content on these sites different sites. You can learn more about which ones.
To add a flattr-link to your Flickr follow these 3 steps:
1. Manually submit your photostream link to Flattr. When the thing is created you’ll be directed to the things page, use this URL in the next step.
2. Add a link to your photo descriptions by using the following:
<a href="the link you got from step 1">Flattr this!</a>
Easiest to do with batch edit. Flickr will add a nofollow in the link but don’t worry about that.
3. Done! You’ve now added a Flattr this! link in the photo description. (It will only be a link when looking at the photo itself not the thumb index.)
Now what? Show people your work, show your donation options and you should be set.