I am really glad you like it, and as for talented, as far as animation is concerned this is really nothing special but it is a good feeling, starting something completely new to you. You can either figure things out on your own which is what I have been doing or you can pull from a whole new world of information. It has been around for a while so there is plenty to learn.
Grimly, you asked what software I was using and I forgot to reply. I am using the animation features on Photoshop, version C4 and up are equipped with it. It is very basic but it has always been my belief that when you are just starting something, you don't need the most high tech gear. It has everything I need but it is a pretty basic package. The disadvantages are that depending on the file size and number of frames, it can lag while playing, even by milliseconds it can still effect your perception of the finished animation so you have to be good at picking up whether it is running slow or if your animation needs tweaking.
About Weiss moving: I went through and animated each part individually and I was considering animating Weiss beyond her eyes but I thought it would be funny to have her standing still like a statue to go with her expression, like maybe she was "Frozen in shock". I'm not sure how well it worked in the finished article. I didn't leave her jacket off because of her sleeves, they would have been easy enough. I left out the jacket because of her collar. It would have really gotten in the way and also I liked how she looked without it. And yeah, everything feels like it takes forever, 1 second of animation is 10 frames! The trade off for this is that a single page doesn't need to be as detailed as an actual drawing because unlike an actual drawing, people only have a split second to look at it so they won't notice if there isn't as much detail. Again there is added difficulty in that you need a much better idea of how things move and since you have a whole rage of motion, you really need to push it as far as it will go. I intend to gradually work up the difficulty over time.
I don't know what MMD is but what you are describing I had not even thought of, strangely. I myself am a catalog of every possible motion I could animate. There is so much I could do and I haven't even scratched the surface.
As for details about my next project: Blake is reading a book peacefully,then Yang comes and bothers her but gets more than she was expecting. They are sitting on a couch that I have't drawn yet. It was going to be a bed but I wasn't sure how to draw it in this angle. Then Yang dives onto the couch. She is going to make a kind of yawning motion then bring her right arm down around Blake's shoulder. I am having some fun trying different things for that.
I would really like to hear about your own experience with the subject.