Environment matters, and so when I draw creatures from a fictional world I like to give them interesting places to be drawn in. I finally put this apartment design onto paper in some coherent form so I can use it as a simple reference later on.
The concept is that multiple apartments jut out from a sloping structure (natural or artificial) but, even though their curved ceilings are entirely transparent, the occupants of one apartment couldn't see the occupants of another (for privacy's sake). To accomplish this, ledges extend out all around at the bottom of the window line with enough plants to obstruct a roughly horizontal view. By also staggering the elevation of adjacent units, the interior is further hidden.
The inside of this apartment itself is meant to have very soft, biological curves. The planted horizon and ever-visible sky hopefully give the interior a very natural feel.
Pen and pencil on 9x12" Bristol board.