well i like this, this placing is not what it should have been, but yeah that happens. I think that if you put the board closer to one of the corners it would have improved the composition. Rule of thirds is often a great rule to go by.
Another window shot??? I find these shots lack interest and subject. I mean you gotta really ask yourself if this is a type of photo you would hang on your wall. I also find the contrast to be a tad on the bright side. Good luck with this chalenge.
Very nice composition of the window. I just don't feel like it says abandoned building to me. The photo also has a green tint, I find a little unsettling. Just my opinion. Do like the knots in the wood, like the softer focus you used.