Isolate the subject, create a glow

Now we've finished work on the background, and it's time to highlight our subject, and create her glow. Fitting, don't you think?

Now activate the view of your outlined subject. (Turn the layer on.) Cmd/click or ctrl/click the layer icon for her to generate a selection based on her outline. You should see racing ants appear. Now, choose Select > Modify > Expand and add enough pixels to cover at least part of the "glow" we'll be making. (There are other ways of doing this "glow" but this is the most straight forward and mechanical -- for a teachable moment.)