For that purpose I used my Photoshop knowledge. I printscreened the hero portraits that I needed, I had an already perfectly cut portrait-border and placed it over the new one. Then I made a selection and duplicated that part of printscreen, so it's just like the other border. I brightened and saturated & contrasted the colors a bit, until I got a near-perfect look, just like if I had unlocked them.
Hope it helps :)