I'd agree with Step, there is some camera shake indicating a slow shutter speed. I also think the metering has been fooled by the window which hasn't helped with the exposure. I suspect it's been underexposed and then lightened hence the posterisation look in the shadows. It's really quantumisation, meaning there is not enough graduation to give a smooth effect. ( Tip if you have to do this on a badly underexposed jpeg , convert to 16 bit mode do the adjustment then drop back to 8 bit, it does help)
Window light shots can give problems, here I think it's one of underexposure. using the histogram function on the camera could help determine if the image has been correctly exposed.
More information would be helpful