Me personally if I had your talent Adrian which I don't...I would airbrush the S-work logo on the downtube like Specialized does on their monochromatic S-works bikes which is real stealthy but classy. Simply add just a hint of black to the current paint color for the graphic for a slight shade difference and hint of contrast. Would add a dash of character I believe.
Well done.
PS: If I get some time, I may photoshop my suggestion for you to have a look.