OOAK = One of a kind. "Upgradeable" = Adopt the design "as-is" or upgrade to a full reference sheet. As-Is: Buyer will get an unwatermarked image of the design for their own personal use. Want a full ref + possible adjustments? PM/Pay minimum of 250$ to get a back view, 2 headshots, and 1 chibi added onto the image! If user buys for flat 50$, but still wants the reference, PM within 1 week of purchase for payment plans.