Welp.. what can I say.
I really like the art, both the back ground and the characters.
I have one problem, and that is not just you, it has begun to be common, even in professional animations. and that is when the background simply do not match the style of the image itself.
Both your characters and the back ground is really well made, so why not make them in the same style?
I would love to see a piece by you with the same style all the way through!
That said. great work. you get 4/5 from me!