This is just my opinion...do you have a lighter shade of brown for the botton of the window or lighter shade of treen for the side? Both the dark brown and dark green are dominating colors and I think if one was a tad bit lighter than the other it would compliment your picture a little more.
Your "Y" corner is fantastic, really sharp and on target, great job.
What ever you do it will be a really great quilt and please show picture when finished!