When I'm looking at your character drawings they seem very loose, sketchy but well defined. Although some of the anatomy is lacking in certain works the style and detail compensates for this just fine, however I dont see this same style in your environment drawings. Is this because you are uncomfortable drawing them?
I'd suggest using the same loose technique and approach towards environments as you do to your character drawings, it might work out for you. Also, just a quick sidenote, do you model all you characters in 1 position or do you model the face and then use blendshapes or other animation techniques to place it in the pose you want?