I started out with an image, of course. Here's a S6 promo of Jorja Fox:
The colors are dull... And of course one has to crop the picture :)
I duplicated the base layer and set it to hard light and it definitely had a little more pop because it was darker and looked a little better. But when you hard light a layer you sometimes run intothe problem of the picture being too yellow which I ran into here.
So I made a color balance layer and just added a little cyan and a little blue. Very inexact, I didn't choose the level that I did for any rhyme or reason, just to add a little blue onto the yellow. I also really like adding a blue color balance layer because it typically makes the icons look a little softer.
THEN I wanted to take her shirt, the background and her lips individually and give them extra color.
I just took a couple of my pre-set colors (just because I really like them) and colored her shirt, the background and her lips each on their own layer. It just happened that I set all of them to soft light, but depending on what color you choose you might want a different layer. Play around with colors (I started out with the background being green- it looked awful ;) ) and also the opacity.
So my layers end up looking like this ^^
And my icon like this:
And then I added my text, but that's completely personal preference.