hi luciachan and welcome to
RP.
overall, you're smoothing the facial skin just a bit too much. this gives the 'pasty face' or 'porcelain doll' look to the faces. you want a bit more texture left there. the last one is much better in this regard; still some texture/detail there.
there are lots of tutorials and help on this here on retouchpro. have a look around.
you're on the right track though. it's nice work other than that too smooth look.
craig