Yes, it's a worm, not a snake.
This doodle was a test for the Pigma brush pen. What I can say is that it's okay when new but very soon the (fiber-tip) brush loses it's sharp edge and it's not very fun to draw with anymore. I'm not getting another one of these brush pens, though I do like the other Micron pens. I read some good recommendations about the Pentel brush pen so I'll try to get my hands on one of those.