But, on the topic point
I do try to get my images to a point where they are hopefully the right colour.
I do this by googling the object in google images, and what pops up?
Heinz soup! 57 varieties!!!! I end up choosing the colours that look most pleasing to me from the vast selection (many by professional astronomers). That also tells me that even professionals can't be decisive about the 'right' colours.