Next I will just be making a quick simple brush to add some more skin tones, I created a new file 200 by 200

Then just painting some simple spots of varying opacity

added some smaller spots

when your happy with it from the menu go edit/DefineBrush. Then I've just added some deeper tones here and there on a blank layer so I can turn down the opacity on the layer to blend it in with layer below.

turning the opacity down to blend a little

next I will make a smaller brush. 100 by 100 time

lots of little spots

painting some darker areas.