That sky is gorgeous, its what I dream about. And the dark blue border works so well with the messy look to it all Your silhouettes are perfect. The only thing I think that doesnt work so well is the garden itself. Because it has so much sharp detail compared to the smooth one colorness of everything else or the jumbled angles and stuff. It's too much of a focus and draws too much bad attention. If it blended more with the sky this would be absolutely amazing.
I really like the trees, but the baby blue/baby yellow background seems a bit... ...I wouldnt even say dull or empty, but just seems like something else should be there... Its like eating cookies w/o milk