All of my drawings have a backstory, at least in my mind. That is how I create. A little story pops up, and various characters then inhabit that scene. I have no idea why this butterfly is in such a sour mood. I thought about it for a while after drawing his little angry face and I just couldn't think of exactly who wronged him. My only guess is that he was living a pleasant life as a caterpillar and had a nice warm cocoon with great WiFi and then he became this beautiful, albeit extremely fragile butterfly. Just out there flapping in the wind, being all "Hey, look how pretty and possibly delicious I look." Something in that transformation rubbed him wrong, and he's not ready to forgive nature or any of its inhabitants for crossing him.