them for eyes, if you have neither a toothpick nor googly eyes available.
make a tiny clay tongue. for a tongue, grab a piece of red or pink clay and place it between your finger and thumb. roll it into a log shape, much like how you rolled your snake but on a smaller scale. split your log in two at one end to create a forked tongue, and attach it to the end of your snake's mouth.
add patterns to its skin, like polka dots or stripes. for polka dots, flatten tiny clay balls with your finger and thumb and attach them to your snakes body. you can make stripes by 