Given the circumstances under which this image was captured, I'd be satisfied
with the results. Shooting through a double paned glass window can be a hit or miss affair as glare and reflection-not to mention dirt on the glass all degrade the final image.
The birds eyes and head are in focus which adds greatly to the overall image and draws the viewers eyes to those features. The feather detail isn't perfect but, under the circumstances quite acceptable IMHO.
I've not owned nor used an 18-200mm vr lens so can't comment on the image quality and sharpness of the lens. But seeing your capture here makes me think it isn't too bad at all.
Congrats on being able to capture the moment.