I like the colours and framing, especially how you’ve fit the tree in the left into the shot. It has a nice curve to it. The only thing I don’t like funny enough is the flag, doesn’t seem to fit. other than that very nice.
No expert and learning myself, So just a personal opinion.
I would have liked to see it from a slightly different angle. off more to the right ( obviously at no risk to you lol) so that the tree does not obscure as much of the turret. I agree that the flag does look slightly wrong. It looks as if it has been put on after the picture was taken. I would be tempted to PS it out of the picture completely. The colours are nice with good detail and texture in the trees. I think this would look good in B&W too. :D