This little cartoon baby dragon is frustrated because he is trying to learn how to breathe fire, but he doesn't quite have the hang of it.
When my daughter was a baby, before she could talk, she had this thing where if she was frustrated she would breathe in and out of her nose really fast. Usually because she wanted to be able to do something that she wasn't old enough to be able to do. It was really cute and funny with her little hands balled up into fists, filled with ferocity, and yet little and cute. It gave me the idea for this frustrated baby dragon - trying to breathe fire, but not being able to.
Here is the orginal sketch: