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This year for Christmas, I painted a Warhol-style picture of Pee Wee for my daughter.
I used the photo above as my starting point. I'm sorry I didn't take pics of the process, otherwise this would have been a very nice "how-to" entry. But in a nutshell:
I enlarged and printed the photo in black and white on the xerox machine in high contrast. Then I traced over the dog's outline from the xeroxed enlargement onto a plain sheet of paper. (I always tape my tracings to the window and the daylight works just like a light box!) On the back side of that paper, I covered each pencil line (back to the window!) with lead by swiping the broadside of the pencil lead over it. A bit of artists charcoal would also work.
Placing the image rightside up on your canvas, trace, again over the lines. This is how I transferred the exact image onto each square of the canvas. I wanted to use carbon paper but who has that anymore?
Then it was just a matter of filling in the spaces with paint, like paint-by-number! It was a very LOW tech project.