From the U.S. Copyright Office FAQ ( http://www.copyright.gov/help/faq/ ):
Can I copyright my website?
The original authorship appearing on a website may be protected by copyright. This includes writings, artwork, photographs, and other forms of authorship protected by copyright.
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It's important to remember that images can be copyrighted just like text. It seems that more and more AR bloggers are spicing up their entries with images. I like that -- it breaks up the text, adds visual interest, and helps to convey a little more personality of the blogger. Just be careful that the images are not copyrighted, or if they are, that you have permission to use them.
Stock images that are available online generally fall into two categories: rights-managed and royalty-free. A rights-managed image usually costs more, is purchased for a specific use (like a magazine ad or brochure), and has managed distribution, meaning it's unlikely your competitors would be able to use the same image.
Royalty-free images cost less and can be used multiple times, but are not exclusive, so several agents in your area could use the same image in their marketing materials.
If you use a website provider, can you use those images on other sites that you develop? Check your Terms of Use. For example, Alamode's says this: "Copy, reproduce, modify, use, republish, upload, post, publish, license, create derivative works from, transmit or distribute in any way material from the Web Site without ALM's express written permission."
Graphically challenged? Here are some image sources:
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As a note, Flickr is a pretty good place to get images to use on your post. Millions of the images on their site are available for use on some form the "Creative Commons" license. I occassionally use images from there, but give credit at the bottom of my post to the photographer to satisfy the licensing requirement.
For more information...
http://www.flickr.com/creativecommons/