Take a look at Yanick's website. It is worth bookmarking!
Truthfully, Juan, it's so difficult to respond to your request since your level of experience may be zero to pretty good and so you need to say where yo are coming from.
There are blemishes to conceal, tones to correct, color to match and or blend with other picture elements and so much more.
Katrin Eissman's book
http://www.amazon.com/gp/product/0735713...ks&v=glance
Is a useful start.
Asher [img]/images/graemlins/smile.gif[/img]