I like the little day bed and the window and beat board walls. day bed on plywood base with built in table. we would put the long edge further back for under the bed storage space. I also would want to paint it like white or something.
We love everything about this window-filled corner, not to mention the view. The picture window maximizes the view, while the double-hungs give ventilation. We also love the low built-in book cases that have function as window seats.