Do you know why your art was great? I honestly tell you that when I was clicked on pic thumb I didn't even gaze my eye on its name or even later read the description. But when I saw this picture. First word sprang up in my brain was 'Momo!'. And that's why your art is great. It's make the watcher or anyone sudden realize of what they are looking at. As for the rest of critique I say there's nothing to said much. Your line art was always great and same as usual, The way you color them still unique. So it is "GREAT!!"
Ps. Something told me that you really picture "Cassiopeia" in the way it suppose to be.