Advice (grain of salt here) from a journalistic perspective:
Essentially: less, less, less. "If I had more time, I would write less."
All that said, I am excited to see where this project goes. I will donate when I have the funds. Thanks for sharing. :)
All three things are quantised and should take 'fewer': Fewer pictures, fewer links, fewer words. Less is for things that aren't countable; less liquid, less wrong.
I have resisted the urge of promoting my blog for many months, but this is literally (per my analysis) for the best cause.
We have also raised a decent amount of money so far, so at least some people were convinced by the arguments and didn't stop at the cute hedgehog pictures.