A post with photos will look nice and get more attention than a rough text blog post. People love to see a nice photo, your post with good pictures will make your visitor spend more time to view, and if they feel interesting, they will come back more times, your blogs will have more regular readers and increase the ranking.
Also, if we name the picture with keyword and tag, it will bring some free traffic to our blog. Where can we get image for blogging? We can use our pictures, but if we do not have, we need take some time to take a photo and select the best one. Another way ,we can get pictures from free or paid service, I will share with you some good sites:
Morguefile.com This is a resource of free photo but you need to credit authors (Free service)
Fotolia.com : They had more than 8 million photos with thousand of clients. You need buy subscription and pay as $0.16-$0.3 per photo (Paid service)
These services will help you save a lot of time for find interesting images for your blogs and you will have more time for your blogging.
