I think you did a great job with the body sizes.  However, the faces on the 2 younger ones look far too adult.  With the current faces they look more like  Little People / Dwarves than they do children.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi