Aaaaaand here's the lineart for Opal.
Arguably, Opal has turned out to be the most detailed out of all the charm designs. Maybe it's because of the gap in time between drawing her and drawing the others? I dunno. Either way, I ended up enjoying the outcome far more than I thought I would.
Truth be told, I'm still a little iffy on how Opal turns out in my style.... but I've admittedly always been a fan of drawing multi-brachial characters (X-iomania and BiOcular, anyone?).