This is a lovely portrait of a lovely woman who, frankly, needs no retouching. Still, occasinally it's nice to see a slightly more idealized or slightly younger version of yourself. And sometimes you portrait subjects request a little sweetening.
So here are instructions to help you subtly brighten eyes, whiten teeth, and minimized wrinkles and flaws in skin.
Just remember, with great power comes great responsibility. Don't go too far! The trick to doing beauty retouching, especially on your friends and loved ones, is making them look like a slightly better version of themselves--which doesn't mean making them look the way they did years ago.
These steps are for Adobe Photoshop CS2 and newer versions.