Now create a new layer by pressing Ctrl+Shift+N/Cmd+Shift+N at the top of the layer panel.
Now grab Brush Tool from the tool panel or press B. Reduce the brush opacity to 15-25%.
We are going to smoothen the skin. In many tutorials you might have seen that people use Gaussian Blur to smoothen skin but I don’t like the result. The method I use is bit difficult but result will be awesome. Zoom in your image a lot. Now suppose first we want to smoothen her cheek then hold down Alt/Opt key to open Eyedropper tool temporarily and then move your mouse over her cheek and press left mouse button. Now eyedropper tool will select the average color. Release Alt/Opt key.
Now apply the brush to her cheek. Do same thing with nose her nose, forehead etc. For best result take sample color after every 100 pixels.Spend around 20-30 minutes on this step. Your image should look like this.