Bella, I use soft brushes with low opacity (you can increase it if it isn't deep enough) using the skin tone colour I capture with the eyedropper on the area of the face that I'm working on.
If you're applying eye shades to the lids or brows, you can create a colour you fancy from your own colour palette and for the brows, sample with the eyedropper from the existing brow line.
Remember that less is more and it's easier to add than to subtract, I've found. Using the Burn tool to apply under-chin or jaw shadows if you've adjusted the chin or jaw line, setting to a low opacity works well. Especially if you need to recreate a proper jawline, like in an older person with jowls and droops.
If you're doing an elderly person (I do some "seasoned" professionals and politicians) and I've found the Photoshop Liquify tool irreplaceable for sculpting away the double chins and turkey necks. My little girl loves to watch me get rid of the "gobblers," as she calls them.
To add realism, you can make a selection and add a wee bit of Noise or use a skin sample with pores (even from the subject themself,) and layer that over the redone areas and adjust the opacity to suit.
That's my bit then.
Maureen
