hi limaze!
basically, the removal of the wrinkles was done with patience and healing brush. I normally use the healing brush tool (combined with rubber stamp at about 30% oppacity) to remove all of the wrinkles (always on a top layer, never on the original). after the wrinkles are all removed (and there are no blemishes on the channels) I ease it off a bit with the layer oppacity lever (moving it down to about 60% oppacity). That is because, on top of all the skin cleansing I also do what we at the studio call a "flesh mask" that consists of removing all texture of the skin and then replacing it with the original's grain.
the most important is to always review your channels and remove any blemish and blurry areas that might appear when you are stamping the image. And never stamp on the original, always on a layer on top.
the process of removing the lines took about one hour to an hour and a half to complete. in a retouching job like this, what takes most of the time (sometimes days) is the hair, because you cannot have cross threads of hair on the image. the models hair has to be all "combed" to the same direction, and in order to achieve this result, you need a 1 pixel rubber stamp, 200% to 300% zoom and lots of patience to remove crossed hair threads.
cheers!!
George Rutherford
www.seagullsfly.com