I placed two adult sprites in front of the doors to show that big doors are necessary 
Ah!! thaaaaat's the rub. your doors aren't too big necessarily, but your people are having some wicked proportional issues. the old woman i'd say is the only one with reasonable setup, although the old man can pass. the adult woman has much too long a torso - the bottom of the bottom should be halfway between head and heel, you've got it maybe 3/5ths. the kids are stylized in a completely different way (super skinny) which suggests to me that they are much taller than you're showing.
