I think the size of the windows works. The only reason it looks huge is because they are the only windows in the tower. Not only that, but they sport the only colour in an otherwise monochrome image. This makes it a focus point of the painting. It also makes it look inviting, which is cause for suspicion. You are forced to wonder what the purpose of the tower is, as well as what fate will befall the wayward travel heading for it. I did not mean this to me a critique, so please don't take it as such. Awesome job, btw.