In this tutorial , I will use 3 steps to make a photography studio levels picture.
First step :clean freckles using clone stamp tools.
This step is very easy , just use clone stamp to clean the freckels (for detial you can see this tutorial clean freckles using clone stamp tools.)
Click Beautify Tab and choose clone stamp tools

Press Ctrl+Left Mouse Button to set the source:
Then ,paint on the freckle.

Do this loop until you have clean all of the freckels.
Second step: soften skin
Wheel and right mouse button to find a good envelop to see this picture.
Then choose soften skin tool from same tab.

Drag the slider of Radius and Strength until you feel the face is good enough.
If you feel the face is so dark, you can drag the slider of Whiten to whiten it.
Third step: use Color Effect filter to make it better
Choose Color Effect tag and click Negative film filter

Drag the slider of Shadow Details to lighten the picture.
Click Reversal film filter in same tag

Drag the slider of Strength close to 65.
We have finished.