Cartoonist Bill Abbot mentions SirianniArt.com in his blog article, found HERE. An excerpt:
As a teacher, he guides his students patiently, and with a coherent plan. As a cartoonist, I’ve been focusing only on what I know, and don’t tend to stray too far from my typical style of drawing – something I’d like to change. The exercises presented by Ralph push me and my classmates to try things we woudn’t otherwise, and he provides subtle direction throughout the process.