I admire your work. Best Models sits proudly on my bookshelf, however this image is plain to me.
I have tried to analyse whether it is the standard posture of the model or the lack of interest generated through the background, however I believe it boils down to the lack of a story.
[link] This image of yours provokes questions into where she is, why does she need a hat without any other clothes.
[link] The setting for this image evokes that of a fairy tale. The surroundings to the girl offset her beauty with their stark degradation.
I find This image lacks those elements of story or questioning. Coupled with the pose not being particularly striking or flattering, it doesn't work for me.