Looking good. The image is a bit bright compared to some others I have seen but the detail is nice. Maybe the LP is causing this. I am not sure raising the black point would help but it may be worth a try.
Also, did you apply flats as these also have the effect of darkening the background? I can see from the original you have some vignetting and a flat would definately remove this and make for a much better image.
Paul
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