i just looked at something similar you did an year ago (first illustration),and i've gotta say you've made some major improvement over the time,and this piece shows it, it looks alot more organized and composed and the characters look smoother.
the piece as it stands by itself is also interesting and filled with details and the characters are all clean and smooth.
one gripe i could probably pick is that maybe the white masks and the dog yokai (quiche i suppouse) could have some colored outlines too if you intend to use colored outlines for most of the piece,but that's pretty much it