This is a very basic how to for making a breast,
I generally keep my burn and dodge tools set to 25% and use a soft brush so it takes me a while to get the shading I want, be patient and it will get there.
From here, it's a matter of tweaking the highlights and shadows that you have made to match the rest of the skin and adding the nipples of your choice. You may find that you need a large soft eraser brush to blend what you have made to the skin you are working on.
