I kind of like it but, Im the opposite here, I dont mind the shadow but Im not keen on the composition!
The tree is a real no-no for me, it looks awkward being so close to your wife, as though you placed it there as a prop ... you didnt did you
Also, the bit of knee at the bottom, its such a small bit youve left there, its not adding anything, so it should go.
My eye is drawn to the clothing & bg as they have the strongest tones, i.e black & white, where as the face is more mid-tones so looks more neautral, so personally Id have cropped in closer.
I think your wife looks rather beautiful and relaxed here, its just the clutter around her is so distracting.. you have a fab subject to keep practicing with though