More to explore:
DigitalCameraWorld.com - 15 most popular photo editing tutorials of 2012
Photoshop Effects: how to mimic studio lighting for stylish portraits | Digital Camera World
Lots of Photoshop editing tutorials
photo edit tutorial - 11 by `night-fate on deviantART
Perfecting and cleaning up an image. Use the stamp tool to extend background and other tools for a seamless background - Jessica Drew Photography
How to basic editing in Photoshop
Photoshop tutorial: Fantasy light effects in Photoshop
Great tip! photo editing & I really need to learn how to photoshop! Beginners+to+Photoshop:+Photo+Editing+is+Easier+Than+You+Think!
Easy portrait edit in Photoshop
Photoshop Edit Tutorial: Night Coloring
Photoshop Effects: recreate the look of a medium format portrait
Portrait lighting cheat sheet - examples of different lighting options and their effects.