Color 101 question (again) ;)

My favorite stallion is a cute pinto named Mantle. Is he a tobiano? He seems to lack a few characteristics I see listed, as tobiano seems to generally have 'rounded' white patches rather than jagged, and white should cross between the withers and the dock of the tail (although a tiny bit does). I also can't really tell if the white is arranged 'vertically.' Might he be anything else? Here are a few shots: http://www.barbaralivingston.com/gallery/album102/Mantle" onclick="window.open(this.href);return false; http://www.barbaralivingston.com/gallery/album102/Mantle2BL" onclick="window.open(this.href);return false; http://www.barbaralivingston.com/gallery/album102/Mantle3BL" onclick="window.open(this.href);return false; http://www.barbaralivingston.com/gallery/album102/OI5I7152" onclick="window.open(this.href);return false; Thanks for any thoughts!