My god, the tweening is real with this one!
For me I always prefer frame-by-frame over tweening, and I get that tweening has its uses, but would it be so hard to make it less robotic? Last time I checked humans don't stop their movements on a dime, they slowly stop and wiggle a little.
The art is nice at least, but you got it commissioned by someone else, so I can't even give much credit to that either.
I'll leave you with this: if you plan to continue doing these "tweeny" animations with commissioned art, you *NEED* to look at how anything moves (including yourself); film yourself if you have to (I know I did that). Just do anything you can to study movements, and experiment with your program to try and replicate those movements. If I can do smooth animations in PowerPoint, you can definitely do it with whatever program you're using.
[having some drawing knowledge helps too, but it's not necessary if the stick fighting community is anything to go by]
RE:
I may come off as salty or cocky, but it's usually when people get so close to making something good, but they're not quite there. Like for this one: I like the art a lot (even if you didn't draw it yourself), but the movements are too robotic.
Also, you're right about me not liking paper doll animations (it just looks lifeless most of the time), but it CAN be done well! For me I see it being used to add subtle movements to a picture that didn't have any, like flowing hair, blinking, breathing, and small body movements.
I don't know, do what you want with your animations. I'm just speaking my mind.