I was asked to make a 2015 watermelon fruit bowl for a graduation party. Before I dug into the watermelon, I decided I should test my carving skills on some of the melons I needed to cut anyway for the fruit bowl. I turned this big honeyrock melon into a frog. It turned out okay, so I tried the watermelon.
The trick to the watermelon for me was to use the little pumpkin carving tools you can buy at Halloween. That was the only way I could make such small cuts, especially in the middle of the zero.