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looks like you have quite a few dust particles somewhere close to your sensor or on your sensor , i can see at least a dozen areas on the photo where they show up . a master flat will remove these and correct the vignetting,you also need to take multiple photos and stack them to improve the the signal to noise ratio, and take some darks to remove in camera noise. sky light pollution is as leon points out your other problem. apart from that the tracking , composition and focus look good .wait until the moon is out of the sky and you should get some great photos.
regards philip
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