What you need:
1.) Photoshop/ Gimp
2.) Patience
3.) Ability to read well and thoroughly
First, open the dds file for the player’s face.

Then create a new layer. Use the brush tool and make your color picker setting like this:

(FYI, that’s the color gray.)
Then you need to paint the part that you wanted to have the beard on, like this. You can either paint his whole jaw as a whole or you can paint a part of his jaw so you can flip it later.

Then go to Filter >> Noise >> Add Noise

It should now look like this

Then go to Filter >> Blur >> Radial Blur and copy my settings

Result:

(It looks like shit for now. But trust me, it’s going to be good!)
After you do that, pay attention to this part of Photoshop

Now see that “Normal” thing there before the Opacity? Change that to Hard Light

It should look like this

Then it’s your turn to experiment with this but since I'm very helpful

Press ctrl+u and copy my settings

And the result should be this

Then I went and screwed with the Curves. Press CTRL+M and so I went on with this settings

So now the beard is looking SEXY

When you’re satisfied with the result, CTRL+A to copy the texture of the beard and paste it

It will look like that but use the Hard Light Blending thing again aaaaaaand Voila!

Now, go to Edit >> Transform >> Flip Horizontally

TADAAAAAAAA!
Now just pair it beside the beard that you made earlier
Outcome:


Now, you do the rest. Do the Alpha Channel, Green Texture, etc.
Credits to:
A guy in YouTube for his original tutorial
Jaosming for his past modding tutorials