It's great to see you say this, one of the best things about your crossover shots are that you stick to a particular style, but anatomically it keeps what they have from their origin (i.e. Felicia compared to the other characters in the Halloween group work). Somehow it manages to make everything fit neatly into the image, but doesn't put everything into uniform shapes and sizes.
Also, some critique, I notice in your older pieces (the most recent example of this being the Korra beach pinup, another example is the Pokemon White Trainer beach pic) the heads are just a bit too big for the rest of the body, and it makes them look really short. Obviously that was a month ago so you may have fixed it and I think I'm notably picky about that specific fault (my art friend doesn't hear the end of it) so don't go spiralling into an artistic depression over it, but it's just something I couldn't help but notice.
Can't wait to see the finished Filia!