I really like your work. There is something very light and floaty about the japanese drawing esthetic when done right that I really enjoy but could never really pull off myself. You've got some really excellent fundementals :)
Looking back at your first art thread you've also made some great leaps and bounds in your line values as well as the physical precense and organic perspective of your characters. I too would like to see some more color work from you, but if there's no time for that, this being sketchbook thing, that's completely understandable :)