When I was activly flying I was called ''an aviator'' but the main term used was ''pilot''. I think the term aviator is an older term used many years ago, today the flight crew have destinct titles, pilot, co-pilot, navigator, air electronics officer, load master, weapons control etc but in a sense are all aviators.
Colouring your model is entirely an individual choice, most modelers prefer to follow an actual scheme that has been documented, this will depict an aeroplane as it appeared when in operation. There are an enormous number of schemes available to cover nearly every type of aircraft that was ever built, some are quite plain drab colours while others were highly colourful, many aircraft especially during the war use the colours specified by the pilot as personal markings. You can of course paint your model in any colour you want, it is your model so you do what you feel best, but to be historically correct following a known colour and marking pattern.
Des.