Take all four line drawings, place them side by side, and look at what you are signifying about our society. That's an important message you keep delivering. This is what Picasso did. He spoke about society from his perspective in the same way you are speaking about the society from yours.n I think this needs to be one style you REALLY focus on in your commercial presentation galleries. Mat and frame them well, but simply. Keep the images tidy and small, say 8x10's which will put them at something like 14x16 or there abouts matted and framed.
The others should be a separate gallery, and are one ups, where the others people will tend to buy in collections and sets, though some will buy onesies and twosies too.
For the line drawings of bent over people, think also about lulu.com and creating an entire thirty page coffee table book of these with ISBN...or, if you don't want to spend the money, just offer them on your own website without the ISBN. Anyway,