I try really hard to use only pictures that belong to me, whenever possible, and to credit photos that belong to other people. I think if you have a blog which uses mostly photos that aren’t yours, your fans and followers are really just fans of the person whose photos you stole. Unless otherwise noted, my photos are mine.
That said – you may use up to three (3) of my photos on your blog if the post is “about” my blog in some way – i.e. you are making a list of blogs you like, or you want to mention my post about puppies in your post about puppies, or even if you want everyone to know how much you hate my blog. You must credit me properly, and link back to my blog. You also cannot use my photos in a directly commercial way.
I don’t mind if you pin my pictures to Pinterest; I’d appreciate if you put my blog address in the description, and if you let me know in the comments that you pinned something, I’d be really happy.
If you want to use my photos in any other way, you must get specific permission.
Part of what I love about the internet is the free sharing of ideas; this is why I give blanket permission to reuse some of my photos under limited circumstances. Please don’t be a jerk and use them in other ways or without crediting me.