Feedback for Indie Game Art

Hello. First time sharing any art here. I develop an indie RPG series (wondering if anyone will know which one from these screenshots) and I'm not a great pixel artist but I'm getting better. This is art for the second game in the series. I had the idea of actually posting my work here to see if I could get any suggestions on how to improve it.  I don't know what kind of feedback I'm looking for yet, just anything in general right now.

Here the entire image of the environment

http://postimg.org/image/manz5dnrn/




Here is it up close, how it will look in the game.


http://postimg.org/image/fzdnt4shr/



I included some characters for reference. The blue background will be replaced by a parallax background I'm working on.


Thanks for all your input!