Nice image, be it a bit small. Washing out one side of the image could be a matter of camera alignment or it could be that you are taking your flats a little too bright or dim. Check the histogram for your flats and also make sure you use bias frames with them. It does make a big difference.
You have a bit of field curvature in the corners but that can be corrected by adding flattener to your imaging train or by cropping the image to remove it.
Looking good though.
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