Using knife, cut 1/4-inch slice off bottom of round seedless watermelon and both personal watermelons to provide stable bases. Use smallest melon for head, second largest for torso and largest for lower body. Set aside smallest watermelon.
Cut tops off large and medium watermelons to create bowls. Using ice cream scoop or large spoon, scoop out flesh.
Using melon baller, scoop eyes out of smallest watermelon. Invert melon balls and reinsert.
Using mini melon baller or paring knife, scoop out holes for nose and mouth. Carve one piece of watermelon into triangle for nose and fill mouth holes with blueberries.
On platter, using large wooden skewers, connect all three watermelons.
Insert y-shaped sticks in middle watermelon for arms.
Fill bottom sections with fruit salad of melon balls and blueberries. Decorate with scarf and hat.