This drawing is interesting from several standpoints. First, I think there is lightening coming out of the clouds. Then the crab is in the sky and not the water (though there is a bird). Why these things are interesting is because the boat is a work boat, i.e. one that her father uses to harvest crabs. She is a vanishing species; the daughter of a real Waterman.
Tea ball and bas ball are very popular around here. But just look at the diversity of this child's mind. I think all the math is correct.
These are twins. The cats are cool, but the crab is a token.