I like you art, so of course im going to like this piece, but seriously, youve used good detail and the black, white, grey colours work really well, and I like the fact that the lines are sketchy and the detail is quite simple yet effective. You might want to try using a bit more tone, and working on the hands a little. Im guessing the girl at the left side is Piper? Yeah, youve got the expression perfect if it is. The girl at the right end, if you drew her again, try putting the eyes at a slightly less exhaggerrated angle. Apart from that, this is very good.
The faces and expressions are amazing. I especially like Silena Beauregard's half smile. The body language is also very well done although Drew's leg is kind of at a funky twist/turn. I love all your art, especially the eyes. I believe that a characters personality can be shown through the eyes and you do very well at that. You normally use color so this black and white picture came as a surprise to me, but it was definitely a good surprise. I like the artistic effect the black, gray, and white provide. I also love Piper's hair how you did some locks falling from the braid and into her face. It really kinda shows her conservativity and her desire to not be noticed. all in all this is very well done I look forward to seeing more of your art.