The page at http://ball-pythons.net says:
You must spread some Reputation around before giving it to West Coast Jungle again.
RAUL!!!! You beat me to it, Pastel example and all! Very well said!!!

If that snake was in my collection I'd note it as a blackback or partial blackback...it has been used as a descriptive term for ball pythons for years, and most folks can recognize it.

Everyone has their own personal tastes as to what would make one a "so-so" example or a "perfect" example.

Just my $10.02 (fuel surcharge thingy again)...