I like the pose. I don't mind that the subject is centered (although it might also look nice off center), but the center split between darker background and very light background isn't working. In general I'd say that the bright background is too bright. My flavor for center composed subject would be to try and fill the background entirely with the ivy covered tree (wall?), probably a vertical. If that wasn't possible I'd swing the camera to the left, making the ivy cover about 1/4th to 1/3rd of the total background, and then burn in the bright background some to reduce the intensity of the brightness (I'd say the face should be the main light toned area), and burn the close up foliage on the left side to match the tonality of the ivy.