First, top 3 search engines:

Google Image Search, Bing Image Search, Yahoo! Image Search

And more:

1.picsearch
The unrivalled search engine for pictures, images and animations

2.everystockphoto
We are a search engine for free photos. These come from many sources and are license-specific. You can view a photo’s license by clicking on the license icon, below and left of photos. Membership is free, without advertising, and allows you to rate, tag, collect and comment on photos.

3.feelimage
This is new image search site. Feelimage is not only key words search. It is also equipped phrase search, that is images search engine ‘FeelPhrase‘. If you can find pictures or images with your feeling, we believe you will find more interesting persons or things. Feelimage have been developed aiming a site you can ‘feel’ internet images.

4.oskope 
oSkope visual search is a free online service developed by oSkope media gmbh in Zurich and Berlin. A great team of highly talented and skillful people worked on this project, very cool!

5.incogna
Incogna is an image search engine that organizes its images by content; when you click on an image, it will find similar looking images.

6.Ginipic
Ginipic takes image search to a whole new level. Now you can search image search engines, photo sharing websites or your own local picture collections simultaneously. Find what you’re looking for and use it instantly in your own creation – document, presentation, art work – you name it. Work alongside other applications with Ginipic in Dock mode. Did we mention it’s completely FREE?

7.biomed-search
Search for images from biomedical articles. Currently over 1 Million images have been indexed. BioMed Seach indexes image captions along with the citations to these images.

8.pixsy

Pixsy Corporation is the leading B2B provider of Video and Image Syndication to websites and applications. The Pixsy Index is a massive library of video and image content that can be integrated into approved premium websites and applications. Key benefits include new advertising monetizing, increased pageviews, SEO optimized content, flexible integration options, and media that can be targeted to most any vertical category.

9.compfight
A Flickr image search tool.

10.tiltomo
A Visual Search uses proprietary algorithms (mathematical calculations) to analyze the similarity & relationship between images.

11.facesaerch
Enter a name and search for faces!

12.picbrk
Twitter Image Search and Realtime image search.

Also, if you find good website too, you can comments on my blog 78hg.com.