First things first, Leave the original image information untouched. If we lose it and we make a mistake, we can always get back to the beginning. So the first thing we always do before doing anything else is make a copy of the Background layer. To do that, go up to the Layer menu at the top of the screen, choose New, and then choose Layer via Copy, or simply use the keyboard shortcut Ctrl+J (Win) / Command+J (Mac). Either way tells Photoshop to make a copy of the Background layer, and if I look again in my Layers palette, I can see that I now have the copy, which Photoshop has automatically named “Layer 1 or Background copy”, above the original Background layer:
To smooth and soften the woman’s skin, we’re going to use Photoshop’s Gaussian Blur Filter. Stay on your background copy go under Filter > Blur > Gaussian Blur. When the prompt box opens set the pixels to about 6, or play with it watching the preview box Click OK. You will see now the image has a blur on it. On the layer pallet set the optacity to about 60 percent.
Next we are going to ad a mask to this layer. Under the layer pallet at the bottom you will see a circle next to a second circle that is half black and half white, Press Option and the solid circle. Notice the picture is back as it was originally, so now we will expose the blur only were we want it, Select the Brush tool and the color white. you will want to zoom in on the image a bit for this.
Now only on the skin, not the eyes or lips or hair but the skin paint it with the white brush and this will expose the blur were you have painted. This creates the effect of air brushing or smoothing the skin while keeping the detail were needed like the eyes and lips.
Save in the format you want and you have just taken years and blemishes off the skin, the model will thank you.