Really beautiful piece of digital art. The colors blend well together. Shading is outstanding. Proportions are accurate. I think that you should have tried a more dynamic angle with this scene however. Something as simple as just giving a worm's eye view can make the whole piece even better. Having that bow pointing straight at you would have been amazing. The scythe looks curvy at the blade part, but then again I don't know if that was intentional or not. The little gray confetti-like things that are flying around kind of take away some of the beauty of the piece. I think that you would have been better off to just leave them out. Other than those few things, this is a really nice digital piece.
Maybe you can add something on her legs/thighs? Maybe you can shred some of that pants (because she's in war/fight)? The left-upper corner is somewhat "empty/no life/action" is there. If you could "do something" there?