The single-pixel-thick limbs attached to rather thick torsos look very strange to me, I don't think it's a good look. I'd either fatten them up some (the legs, at least), or make the torsos slimmer.
If you're going for a diorama look, maybe try working with a smaller scale? The locations feel rather empty because you're trying to make them to-scale with large sprites. If you use a smaller scale, you could make the settings tighter and have more detail-per-pixel without necessarily adding more clutter to the scenes.
That said, more clutter rarely hurts at any scale :] Check out real locations and real people's rooms (not stock photos) - things are always imperfect, and there are often various objects all over the place. Even tidy people often have more things in their space than you might think. The same goes for exteriors - things are rarely perfectly aligned, and there are lots of objects that we artists take for granted and often forget to include.