I really like the concept of this image and the serene atmosphere. Great job!
I agree that the woman is a bit small in relationship to the Elk, but as mentioned by John, I like the artistic implication and I don't think I would change it. While I think your selections are getting better, I think the real problem is in the woman's lighting. The lighting of the background is diffuse and coming from high and in front. The lighting on the woman is bright and coming from the right so it doesn't match. As has also been mentioned, she appears to be hovering and not blended well with the ground.
I don't know if the yellow spot was part of the original image, but if it wasn't, I would do away with that. I'm not sure if it was meant to simulate a lens flare, but with the subdued lighting of the BG, I don't think it goes well with this comp and draws the eye away from the subjects.
I completely agree that you should continue to work on this image.