In case you're wondering, I find snakes the hardest animals to draw in cartoons. It's not body composition, believe me, that's the easy part! It's getting the head to look right is what's so hard about drawing them! To help myself out, I found some model sheets of Kaa the python from Walt Disney's The Jungle Book (1967). They're good resources to learn how to draw snakes(especially the second one for heads!)
Before you ask, I am a Wolfgang Reitherman fan (That's who directed The Jungle Book). His style of drawing and directing really just captivates me. In my opinion, he actually did the best cartoons for Disney in the 1960's. His drawings are rather almost like Chuck Jones' drawings to me.