Alright, check it out - we did an exercise where we painted a cityscape in under 45 minutes. The theme was "ventilation," so I filled mine with all kinds of vents, fans, pipes, hoses, etc. I liked how mine started out, so I went on to throw on some colors and other finishing touches. Below is the finished product:
Basically what I took away from all of this was more commitment in line weight. I had fun using thick dark lines in this one - I'm going to experiment with it a lot more later.