You'll do yourself a favor to visit this site to look for Stock, it has over 4000 search-able Public Domain photos. Yes, you can legally use them all! [link]
Photographer Petr Kratochvil has placed this photo in the Public Domain - (free for any use without credit for everyone)
This photo is in the public domain. What is in the Public Domain cannot be taken out of the Public Domain. You can alter a work and then copyright the alterations if they are significant changes. Minor tweaks and alterations are not copyrightable and certainly the underlying original image remains in the public domain. Deviant Art does not offer the option of NOT assigning a license to an uploaded image. Therefore I've uploaded it under a Creative Commons License. My above license on this work is not valid.
(This is because I have not adapted it.)
Thus the image remains in the Public Domain and is not under a Creative Commons License as displayed. It is uploaded here so that members of Deviant Art can locate and have use of it. Basically I am bringing it to your attention because its a quality useful photo you might otherwise not have found.