Best source for photo is flickr - there is a lot of "live" photos what is good for blogging
- Go to flickr advanced search
- Check the box before "Only search within Creative Commons-licensed content" at the bottom of the page
- Type your search term in "Search for" filed at the top of the page - in our example search term "Flu Shot"
- At the result page like this results for "Flu Shot" just find photo you like
- At single photo page press Button "All Sizes" over the photo
- Chose size of photo you need - it must be wider then 400 px - example for "Flu Shot"
- Resize it to 400 px width using your image editor add add it to your post
- (!) Add photo credit at the end of post with link and name of photographer
That it!
Question and suggestions are highly appreciated
Other way to find photo
- go to images.google.com and enter your keyword
- go to images.yahoo.com and use your keyword
- go t0 google.com and enter your keyword plus word "photo" example "celebrity headband photo"