I have to agree with rex - it's a little disjointed. The Eldar wings (on the other model too...) have to go for sure! The painting technique is fantastic, though, and makes up for the composition. Bla, bla, bla - it's really cool!!!
The painting is really great, but I have to agree that she's too much of a mish-mash of tech parts. I guess to someone who doesn't play 40K and can't ID all the bits it is better.
I hate to spoil what you have going here, but I really hate the composition. The subject is ok and the work is really good, but the composition really really stinks. I can obviously tell where all of your parts came from. The assassins rifle, the Tau cannon and missiles, the eldar wings, the dark eldar blade. It looks very mismatched. If she's a "deamon hunter" as you say, she should have something to smite deamons. She shouldn't have all this alien tech. The bird thing is implausable too. It's wings are way too small to support all that weight. The whole thing smacks of a drunken night in the bits box gone horribly wrong.