1) I first grabbed a computer and googled “angry cartoon eyes” then found the pair I wanted.
2) Since I can’t draw: Next, I used my projector to project them on the wall where I wanted them located and used a pencil to trace.
3) Then I went back with some paint and painted in the lines.
4) Just to give it a little more definition, I went back through and outlined the eyes with black paint.
And now I have an angry vent that makes me giggle.
Remember: “If we didn’t laugh, we’d all go insane.” Not everything in a shop has to be practical. ; )