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Pretty darn good for first attempts!
If you can take some flat field images (white t-shirt over the scope and pointed at a random blank part of the sky should do it) then you can remove any hint of vignetting you have at present - which will give you a nice even illumination across the field of your images. They'll also help you keep the noise balanced across the image during processing, so you don't have to clip the left (black) side of the brightness histogram.
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