Thank you guys.
ruhebitte-I sculpted the basic form,then I masked it using a skin alpha and trying to follow the form of the cheek.Don´t mask it thinking in the small details,this mask is to sculpt the bigger folds.Once the skin is masked I sculpted with the Inflate brush and the Claytubes brush without an alpha then inverse the mask and sculpt with zsub,for this there is a fantastic brush called Dam_Standard,search it in the forum.
Then , when the bigger folds are ready, you can to start to add the finnest details using skin alphas with the standard brush at the dragrect mode or how you like more.
Sometimes I can´t mask very well using and alpha because the result is very blurred and using sharpen doesn´t works because I lost a lot of detail.I´m sure that playing in the alpha palette you can do this,but what I do is mask one time and then I go to the Stroke palette and hit Replaylast some times until I like the mask.
I hope you understand my explanation because I know my english sucks.Sorry.