What was the focal length you were capturing at?
I hate to be a downer but you'd really need exceptional conditions and an exceptionally long focal length (10-14m or more) to capture any kind of detail on Neptune - and even then it's unlikely.
It's a great image, especially with a DSLR. But when it's upsized the amount it is, it's extremely unlikely that you can trust any changes in colour on something that literally would've been a few pixels across when captured.
Nice work though!
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