Wow -- they look great! I like the fact that Zoe is not a common angel, but looking a bit like a punk-angel; really badass! And in addition Julienne with her pale skin looks a bit like a demon. Interesting persons who make an interesting story, I'm sure. Good work! :)
From the look of your characters, the story must be a very interesting one! I love the color schemes on both, and both look like they could kick some serious butt. Actually, they look like they already have. ^^ My favorite thing about them is that they don't look like perfect good guys, they look like they have entire stories behind them, as complex as their design. That's the sign of good characters! Nice work!