I like it.
Personally I might have gone with a slightly differently shaped sweep... a continuous curve from front to back. mimicking the front fender shape, beginning the dropoff immediately aft of the grille, not following the line of the hood and then beginning the curve.
But that's like arguing Italian vs. Chinese food, or chocolate vs. vanilla ice cream... it's personal preference, not "right" or "wrong." If it pleases your eye, it's "correct." I like the concept, regardless of the specific curve shape. You're going to have a very unique Rolls when you're finished, and that is what's so cool about what you're doing.