Hand-drawn cards

I have a mild problem with birthday cards. I love giving them but my frugal side struggles with the notion of paying upwards of four dollars for a folded piece of paper. My solution is to draw my own cards. It's a lot more work but sits better with me. Of course, that means I have to come up with my own jokes, most of which involve the cake, presents, and other birthday items being eaten. Here's one of my recent cards, drawn for my nephew.

The concept drawing:

The final card: