Michael, Keep it up. If you're like me you'll enjoy it more and more as time goes on.
One mistake I've seen people make when they're uncomfortable with street shooting, but secretly would like to do it: they start out by using long lenses, hoping they can shoot from a distance and not be noticed. That doesn't really work. You're just as likely to be noticed at a distance if you're carrying around a long lens as you are at closer quarters with a short one. In addition, when you try to do street with long lenses you end up with perspectives that are unnatural and give the game away.
Street, by the way, doesn't always have to include people. Your "Elevator" is a good example. It's first class street shooting.