For future reference...
I have painted several cars with pearl. I always get 3 or 4, 12 inch squares of sheet metal and paint the base coat on them. Then apply one coat of pearl to 1 sq, 2 coats to the second sq, 3 to the 3rd, and so on. Then you know how many coats get you your desired effect. You would only be out some material and not left with a car you are unhappy with. Paint matl's are very pricey and wasting them usually makes most people pretty mad. Some of this falls on your painter. He should have known what effect gold over black would create. What you wanted was gold metal flake in your black paint, not gold pearl.
The only save I can see is maybe two tone the car and repaint the sides and the center of the hood black and put another coat of the gold pearl on to make it more gold, not brown, and reclear. Sorta like a Turbo T paint scheme. Hot Wheels even made a gold and black GN last year. This would sorta avoid wasting the effort already put in.
Just a thought,
Coach