Nicely seen, using the natural elements of framing. Only suggestion I have is possibly cloning out the one vertical black branch in the opening of the big branches. ((7))
nice capture, and great job framing your subject. i hope you are not getting overlooked in this huge challenge, and that you are getting some good feedback. if anything, i think your image just needs some cropping. take a look at it after taking 10% off the bottom, 30% off the right, and 20% off the left. it makes a world of difference--that turret just POPs right out! well, that's just my opinion. you have a fine image, and i hope it does well for you. good luck here, and in the challenges yet to come!
While I like the tree framing the structure, the composition still feels a bit too centered. Perhaps move to your right a tad? A little more detail in the tree would've been nice too.