Charcoal and chalk

First attempt at making a sketch with charcoal and chalk. Ran out of patience towards the end and messed up. Notes to self -

1) Need a better way to "make" colored paper than simply paint it. Might try colored washes
2) Got the facial expressions okay, especially for the girl on left. Messed up the one on right somewhat
3) Should stop if I run out of patience rather than ruin the entire picture *biggest lesson learnt here*
4) Need to observe what women wear a bit more carefully. Kind of clueless about sketching the dresses