I personally do not think that window looks bad at all. It helps by not distracting, specially becouse you centered the window. If you can see what is outside that wolud be distracting.
But lets go on. If you shooted in RAW, try to rescue some information on the highlights moving the curves on that zone.
For the hand, crop it. This will make the composition better becouse they are looking at the right and you do not have much space there.
Besides that there is not much you can do on this photo.
But next time try some things. Shoot in RAW and underexpose a bit, so you record some information there.
Use a fill light so you have more light on the inside and you are forced to close a bit the aperture, reducing a bit the light on the window.