Just a simple effort of optimizing your images could boost your search engine rankings to a whole new level. This is why it is worth taking the essential SEO tips to do it.

Here are Justin Palmer's SEO techniques for google image Search:

Alt Image Text: Probably the most significant factor in ranking for an image search is the contents of the image alt property. Basically, the alt text should contain a brief description of the item as if you were explaining it to a blind person. After all, the original intention of this property for the vision impaired.

Surrounding Image Text: Google will weigh the surrounding text heavily when in determining what the picture is about. Be sure to place relevant keywords above and below the image you are optimizing.

Image File Names: Another important factor is whether or not keywords are in the image file name. For example, if you were trying to optimize for the word "Christian t-shirt", you might name the image christian-t-shirt.jpg. Of course, it always difficult to optimize this way if you are forced to go back and change the name of existing images. Keep keywords in mind when you are naming them in the first place.

Link Anchor Text: Although it's somewhat uncommon to link directly to an image that's not in a web page, you can greatly increase your ranking by using relevant anchor text in the hyperlink just as if you were optimizing for a webpage.