incinerated and latus: To do cat studies, I suggest looking at the skeleton, then muscle, then hairless cats (this was fun ), then the furred ones. Getting a good grasp on the skeleton will make sure you get all the proportions right and general massing, muscle will make sure you have a better idea how it moves and more massing, and hairless cats will get you an overall look at the critter. Hair (length, and color) are just icing. I'd never drawn a proper cat before, but the warp sequence only took me about 45 minutes. Maybe 25 for the first cat, and 10 for each after. However, I spend most of 2 hours doing studies before that.