So I drew this bird, and then decided to draw a cage for him. The cage gave me a lot of trouble; I kept trying to draw the bars that should be IN FRONT of the bird and it just wasn't working. The bars kept covering up important parts of the bird's face. Finally I realized that it's just a cartoon-- you don't really NEED to see the front bars to buy the idea that he's in a cage-- so I took 'em off. Problem solved.
I also added an image of a piece of old cloth to the top layer to dirty up the image a bit.
Drawn in Photoshop with the graphic tablet.
Here's the original bird sketch.