First of all, the anatomy is well done. The details are very intricate and delicate; great job! The swords are very beautiful, and I am fascinated by how the blades look like dark fire.
I commend the drawing of her hair and the horns. Being one of the first spots of the picture that a person could see, it was drawn well and it complemented the atmosphere of the art.
The rose petals were done very nicely too, so were the flowers!
Although the white wings seem plastered to the background-maybe it would've been better if they were given a bit of shadow and illusion to look like it were part of the character's body (unless it's really a part of the background). And the blood. I like how the blood is splotched evenly on the photo, but I suggest that the blood on the shirt should have been fixed a bit so it would go with the shadow.
All in all, you did a great job. The flaws aren't noticeable, don't worry, because they are overwhelmed by the better sides of the drawing. Kudos!