Personally, I like more naturalistic colorings, but I know that a lot of people like using different colors on theirs. That is 100% okay with me and just because something isn't exactly the color you want it to be doesn't mean its wrong. I haven't made any species, but what I do understand is that species templates are just that, blank templates. The artist adds the color and the personality to that template. The person who made that template can't just say "you can't use the color green on this template" or something stupid like that, and honestly, if someone does that, I would advise to break that rule. Art is in the eye of the beholder, not in the will of the original creator.