Color keying is important to getting ' a look ' Looking natural is using colors where they belong . Too many colors spoil a theme.
Gas tanks are the motorcyclists framed canvas . I'd suggest buying another gas tank, sanding it down, JB weld the seams, sand
the cured JB, prime with red primer, let cure a few days, scuff sand, than many coats of gray primer. Let the gray cure for a week,
than sand to perfection. Now your paint will R O C K ! BTW I like your Drive Chain Tensioner, is that a kit, or homebrew ?