This is a lovely portrait, particularly version 3.

However, having the light part of background brighter than the face means that your eye is drawn to the wrong part of the picture first. The key part of this image is the girl's face so, in this setting, it should be the brightest part of the image, i.e. brighter than the light part of the background. The viewer's eye is always drawn to the brightest part of an image first.

I'm sure this could be sorted in Photoshop - and then this really would be a special image.

Hope that helps.
Steve