The canvas area outside of a document’s boundaries is gray by default. You can change it by Right-clicking anywhere on the canvas and choosing Select ...
If your subject has dark eye sockets, press Command-J (PC: Ctrl-J) to duplicate the Background layer, then change the layer blend mode to Screen to ...
Want to try new filters that are incredibly fast and yield unique results? Look no further than http://labs.adobe.com/technologies/pixelbenderplugin. by Bryan O’Neil Hughes