A great result for your 2nd astrophoto. Good detail and colour and nicely framed. Best bet is to increase the length of your subs if you can without increasing noise enormously, otherwise take lots more subs. 3 mins isn't really long enough to work up a decent signal to noise ratio and the noise limits how far you can stretch the image. I can relate to the tree situation,my backyard is the same. Can you leave it set up and grab more subs on a second night? Only other issue is that focus looks a little soft. I think those stars are a bit bigger than they could be.
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