-Even if I was against editing images, you can and you should correct them (since I'm working in advertising probably my dtp guys -image editing- complained too much and influenced me..:)
-Helicon filter is a great tool.
-Any light is good and you can do miracles without shooting in a studio.
-Image composition it's very important
-Be creative, don't follow the rules (but you better know them)
I will comeback with more details, for the moment some images I took today (Getty, Corbis style). Nothing creative, just practicing retouching with Helicon
(This one reminds me of Angelina Jolie. Btw, kudos to the model, Erika, she's one of the best)