Author this is a real cool image, but perhaps you should spend some time reading the rules of source usage.

http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/

This is BEAUTIFUL!
But you can't use Google Images, unless they are from a royalty-free site, and then you still have to source cite it to prove that the copyright holder doesn't mind you using it...
Perhaps you can find similar versions at Everystockphoto.com or other "free" stock reference photo sites.

Yes, you right,i didn't find any copyright info about the images. How to remove the image?

Generally, ANYTHING you see on a Google Image Search can be considered "all rights reserved," and you can't use it without direct permission from the photographer...
You can remove the image under "My Contest Entries" under "My Stuff" in the top Menu Bar.

In the case using Google search, you can find the legal source by using Advanced Search (close to the box for the key word). In advanced search, go to the bottom and change the option of Usage rights: Return images that are "labeled for reuse with modification". That means the image is under the Creative Commons license and re-mixable. Just remember don't use the others' artwork to make your entries. Good luck!

thanks for advice people.