Just Hotsync the picture to the handheld, and start scribbling.
The application comes with five different doodling tools and a place to change the width of the tool. You can leave notes on your handheld and even add some ears to a picture. You can color on top of an image or share drawings by way of IrDA.
This application is a lot of fun. When you're done with your image, just beam it to a friend.