A Picture's Worth 1000 words: Optimize Them All
A picture may be worth a thousand words...but unless you're optimizing those words for search engines, chances are those thousand words will be lost in translation.
Here's something some of you might know, and here's something that will shock some others: Search Engines can NOT see images. That's right. You could populate your site with images rivaling the beauty of an original Monet masterpiece, and search engines won't see a damn thing.