Hi Malcolm
You have an excellent image in my view.
You ask about star colour.
What I suggested not cricket but I see these things as open to a little "human" intervention at the end..the artistic licence you may want to claim or not.
There are probably only a couple of stars that you are not happy with but even if a lot you can do this...I don't know how to do it in Gimp but I do have the largest version and am sure what I suggest is possible...make a solid colour layer in the colour you would prefer for your star, layer your image over the solid layer and use the rubber tool over the star to bring out the colour you like...very gently and I think you can select a blurred edge for the rubbers edge. You probably need to do fewer than you think as your eye most likely will "correct" others less orange...we see what we want to see but the brain needs some reference.
As I say it's not cricket but that's what I would do...hopefully someone will chime in saying don't listen to that idiot and give you something better.
Alex
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