buildzion.com

For a free high-quality, sophistacted image editor, we recommend www.gimp.org or gimp.org/windows.

www.gimp.org

For documentation: User Manual

Another great, easier-to-use image editor / viewer is XnView at www.xnview.com which supports minor editing like fixing red-eye, cropping, and converting image file types. 

XnView is provided as freeware for private non-commercial or educational use (including non-profit organization)