To draw heads it's ok, however the hard is the body. When you are starting to draw like me, you need to ask questions to yourself. For example, when I draw a bear it need to be a bear and how is a bear? I love the rolplaying games and I love Pathfinder so...The result is TANK. A bear is a tank, for that it's necesary to have a large torso. The legs aren't so important and it's more adorable with short legs. And the head...the circles are adorables too xP. That are my bear's proportions.

PD: My draw is horrible but you can imagine it xP
PD2: That picture remembers me to portal xDDD