Architectural photography is extremely tough to do if you're wanting striking images. And you need to be a pro when it comes to composition or you end up with a lot of trash bin fodder.
When it comes to street photography (just heading out with a 50mm and a little change for sodas) you'll want to try to get a unique perspective. The street musician is a perfect example. It looks like you saw a guy strumming a banjo, walked over and snapped a shot. Granted....he was probably the most interesting thing happening for at least 3 blocks in any direction, but that doesn't mean that any old picture of him will make an interesting photograph.
Try this.....go to a hardware store and get some knee-pads that construction guys wear. Next time you go walk-about with your camera wear them. Every time you see something interesting, get down on your knees and shoot.
You may get nothing but a bunch of snoozers, but after a while I can almost guarantee that you'll start to look at things and think "OK, how can I get an interesting perspective here", instead of just pressing the shutter release.
BTW..I did get what you did with that streetlamp. I see that you intentionaly composed it that way. It didn't make a spectacular image..but that is the sort of thinking you'll want to develop.