I think the ceilings have been almost completely neglected, lacking detail in comparison to the walls or floors, save for a couple of lights here and there. A featureless, gray brickbottom ceiling rarely complements elaborate walls and flooring, not to mention it can make transitions between spaces very sketchy, like the border between the living and dining room of The Dawson. (The rooms have entirely different color schemes and are different kinds of spaces, yet the ceiling is shared between the two.) The ceilings could be higher, making the spaces seem less cramped even if they're small. Higher ceilings also give more space to play around with lighting, as with a ceiling only ~7 bricks tall you're pretty much limited to only using a single brick or plate as a light.
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Other than that, seeing that the houses are mostly well made, all I can do is shove my picky personal views here:
(as if the stuff above wasn't cluttered with personal opinion already D:)
To me, building is about improvement and experimenting in order to push boundaries. The design choices I see around the houses seem really safe and generic: striped wallpapers, closed and separated spaces, and essentially the same exterior and interior style in each one. I didn't really find anything in the buildings that made me stick my face to the screen and think "Wow, never though of doing that!"
Seeing you (or you guys) already have good building skills and seem to have some eye both for the interior and the exterior of a building in terms of their details and as a whole, I think you should be able to lay off the reference images and create something newer and more interesting. Instead of reiterating existing designs (which you already seem to be skilled at), why not challenge yourself and try to create something radically different from what you usually make?
Something I'd recommend starting with is paying more attention to vertical spaces, rather than only horizontal ones.
