To add more depth to images, I usually add some type of artistic elements to it instead of having a flat graphic on a page. Whether it’s an image on a PowerPoint slide or here on my blog, I’ll add a shadow, soft edge, border, etc., to add another dimension to it.
When I needed to dress a graphic in WordPress, I would fix it in PowerPoint, resave the new style as a new graphic, then insert it into a blog post. After a few times doing this, I looked for a better way. And with WordPress, this is usually in the form of a plugin (computer code).
Image Shadow Plugin
After a quick search, I found one that automatically adds shadows to any jpeg I insert into a post. Check it out at http://rmarsh.com/plugins/image-shadow/ and let me know what you think.