pictogram design

A4 D180 D9 C3 FB 4517 8454 52 AA1 CC7 A92 E 1 105 c
A4 D180 D9 C3 FB 4517 8454 52 AA1 CC7 A92 E 1 105 c

Interesting field (bit niche): how do you design icons and pictograms that are recognisable, communicate clearly to the widest possible audience, and yet have something of their own?

Question for example: why is the baby's head filled in, the parent's not? I think it's a good choice because it gives the baby's figure more "weight", literally and figuratively, it doesn't get so fussy in that area. The visual balance is also better this way. And you have more distinction between child and parent this way.