I did my personal analysis of your pic compare to your other pics I have seen here on dA.
Style and fashion of the model including posing is beautiful. The choice of your format is good but I am missing the contrast of her fashion against the background which is in nearly the same color as the blue door while the upper part of the model is in good contrast against the background.
The model with the yellow background in total would be better for the whole pic. The background in the lower blue part is not as sharp as it could be. The top of the pic is confusing the pic. A crop of this pic with the model with less shown surrounding would make this good pic to a excellent picture.
All this is my opinion only and not valid for different thinking people.