Technically very good, but it lacks at some points. First of, the head is too small. Maybe it just looks tiny, but in that case, just show more of her face. Since we're looking up to her, we shouldnt be able to see much on top of her anyway.
Still, very nice work. The colours are good, the flair is nice and all. Maybe point out the focus a little more.
At first it looks nice, but when you look closer you notice lots of "bugs". It's the proportions of woman. Her loins are strangly off, her left thigh is too wide when compared to tiny waiste. I absolutely love how you did the armor part - specially on chest, and crossbows. I don't really like showing breasts- I know it happened in one of official artwork but to me it makes character look much less serious - but it's personal preference. And I think her face is too much in anime style.
Colours on the background are absolutely fantastic and I love it. I will even ask how to get that "canvas" feel which happen in many D3 artworks. That it looks like painted in traditional way. I must know it.
After taking another peek from distance ... well I think her pose abit strange. I was trying to imagine If I was about to sit in such a way, and I don't think that howling crossbow so widely apart would be uncomfortable, if you'd stand on the ground that would be a different story. But being in this pose, and sitting on such a thing, It seems to be painful to holdem this way. At least that's my impression.