Editing your client's face is a great way to make the work on the brows pop a little more on your social media/brow portfolio. You never want to edit the brows, but the surrounding areas like the eyes, cheeks, chin, and forehead are a great way to make sure your client looks good if you are going to post their photo. (with their consent)

Apps that I personally use-

FACETUNE 2

SPLITPIC