Name your image using the same key words as your title. For example, if you are selling Listerine Teeth Whitening kits, name your image, "Listerine_teeth_whitening_kit." The name you create for your image becomes the alt tag for it, and search engines can find it and direct traffic to your image. So, not only do you have the item title out there, you now have the image title, in addition to the key words in the description.
Naming images is an effective trick to improve search engine optimization. So next time you are taking batches of photos, take a few minutes to name your image something specific and relevant, rather than just the random number your camera generates.
How to Handle eBay Image Theft
How to Make an eBay Photo Backdrop for Less than $1
How to Make a Collage Photo for eBay Gallery Images