Summertime in the Bay Area: the evolution of a drawing

You may remember the double model session from about a month ago. The one with models Signe and Lisa that occurred in my anatomy figure drawing class at Berkeley City College. The instructions were to expand on the resulting drawing by giving it a narrative and/or context.
​
Admittedly this is not my forte. I hate details like backgrounds so the assignment was actually a good one for me. Thinking of nothing better, I used my friend's garage in Albany, California as the backdrop. Why? I really have no idea. I guess I just like the shape of it, the perspective and the way the light fell on one side giving it a groovy dimension.

Here's the photo from which I based the rendering:

Overall I'm pleased with the results although I see things that could be added (more sun dappled shadows on the sidewalk for example). It's a wonky drawing but that's ok. What do you think?