In a blender add the bananas, water, and vanilla extract. Blend until smooth.
Transfer half of the smoothie mixture into a bowl. Into the remaining smoothie, mixture add the cherries in the blender. Blend until combined and pour over the bowl.
Take a chopstick or similar thin utensil and move it in an s-pattern throughout the smoothie bowl to create a swirly look. Decorate with fresh cherries and blueberries.