How Do I Pimp Photos?

Hello folks
I'm an average photoshop user but i am really keen on learning how to pimp pictures using photoshop. I'm amazed at how well pictures are pimped to the point that Obasanjo can be made to look like Denzel Washington (no pimples). I really do want to learn how to. Besides, i'm a web developer and pimping photos could help me in maintaining a form of originality without compromising beauty if i have to use my client's pics. Pls help peops. MAterials, ebooks, links, gimme all