I simply drew an angry person. 

Since I'm going to draw a scene where he gets angry and hits the desk with his fist, I first drew a simple desk. 

I drew the skeleton of the person I wanted to draw, using the desk as a reference point.

I drew it simply with straight lines, and made the face a little bigger. 

A human figure is drawn on a skeleton. He is slamming his fist on the desk, looking very angry. 

I colored the human form.

And finally, I drew the facial expression. 

It's complete. It's a person who gets angry and punches the desk. 

Drawing an angry person