I've spent a lot of time the last few days going through my blog and making sure I only use photos that are Fair Rights or my own. Why? Because apparently giving credit for a photo or linking back to the original site are not enough.
I read a harrowing experience from this author who was sued. Your information is sound and, for me, a lot of it was surprising. Take a moment to read it, and then make sure your blog can't be targeted. Might take you a few hours.