Power Girl
Power Girl is, of course, built on a Wonder Woman base.  First, I cut off all of WW's hair with my X-acto knife.  I then ground off WW's chest symbol, boots, belt and braclets with my Dremel.  I then sculpted on Power Girl's  boots and gloves with Sculpey.  Next, I sculpted on her hair.  This took quite a bit of trial and error to get it right.  Finally, I painted and sealed the figure, and added the cape made by my wife.