LOL! That's the part I think I might have trouble with... BUT my daughter's been learning to draw (and surpassing me!), and she draws with formulas... that's the best way I can think to describe it... with ovals & circles & polygons, then fleshes them out. She's even started doing little comics too... Of course, she wants to write & illustrate children's books and she is well on her way! Oh, anyway, my point, maybe that's the key to getting them the same everytime? Formulas...