Edited for 2017
Adding original, interesting, optimized images to your WordPress CMS is a great way to set your website apart from it’s competition. Having properly titled and tagged, original images in your posts and pages will help you out-rank all those competing pages that don’t. And that’s many of them.
First, always edit the image file names before you upload them to your WordPress media folder. Also before uploading add meta data to each image. Do this by right clicking the file >properties >details, then edit the details.
Now you can upload the pics and once the files are uploaded to your WordPress they’ll be in a neat column ready to edit again 🙂 . Be sure each image info field is filled in, removing any dashes or numbers from the title, adding a keyword phrase to the Alt text plus a short, descriptive sentence in the description field.
Also always consider optimizing the size of your image file. If I’m going to display an image on my site at 500px width I generally upload an image of that exact size. This way the page will load faster since the file is smaller. The image above is a little larger so one could click and zoom. The one below is optimally compressed for page speed.
Images of the products & services you provide are a great place to start:
Visit Google Pagespeed to check your images for compression opportunities.