OK.. I have to ask. You write in your post that you know you posted this in the wrong place. The Trade section is for trading, not selling, as it clearly says... and you obviously clearly understood that. Yet you posted this there anyway. What gives?
Impressive! Nice and clean... your BMF is especially sharp. Now clean up that shaky edge on the black trim on the back of the car. Maybe use a small brush to straighten out the flat black, then foil the top and bottom horizontal trim to get a really sharp, straight line.
Wow! Very cool! And man oh man, I love that shade of blue. And thank goodness you showed an example, otherwise I would have had no clue what "pump the guards" means! Here in the states we call them "fenders"... BTW.. it looks like those rear "guards" could have stood a bit more "pumping"...
Unless you want to model that specific car, which as Art said was a one-off... as far as "period correct" color, anything goes. RRs were made (and painted) to order. Of course, there were the "typical" RR colors, as those cars were most always owned by rather conservative types who favored conservative color schemes. Do a google image search for 1934 Rolls Royce Phantom and you'll instantly see dozens and dozens of color schemes. https://www.google.com/search?q=1934+rolls+royce+phantom&biw=1535&bih=866&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAmoVChMIq8eKoJC7yAIVQTk-Ch1_CAL3