A little school bus sketch on a Sunday

On a little mini work break while my parents are in town and catching up on some sketches and such :) Here is a little rough sketch of some kids going to school  for  Sophia's  Sunday Sketches.  Hope you have a great day. :)

P.S Here is a really good link to a guide on facial expression
http://cedarseed.deviantart.com/art/Emotions-and-Facial-Expression-47118559?q=boost%3Apopular%20emotions%20tutorial&qo=6