Photographs & Images
When presented with a page of text and images, our eyes are naturally drawn to the images. Social media posts and blogs with images are statistically far more likely to get more likes, retweets, and shares than those without. However, when sourcing images, it is VERY important to make sure you are allowed to use the image, do not simply assume that because it is on Google Images, it is free to use!

A good source of free images is available from Pixabay. The majority of images used on this site were sourced there and they were all free!
Another option for free photography and images is a relatively new image bank called Pikwizard.com.