It all comes down to HCB's dictum: "Photographing is nothing. Looking is everything." To that I'd add Winogrand's observation: "Photography is not about the thing photographed. It is about how that thing looks photographed." You have two things going for you, Stamper: you're looking, and you understand how that thing will look as a photograph." When you join those two things in a photographer, you end up with a mature photographer. You're on a roll. Keep rolling. As far as luck is concerned, as HCB pointed out, "It's always luck. You just have to be receptive; that's all." Any time you walk down a street you're liable to have luck, but for the luck to matter you have to have a camera in your hand and be looking. You're doing that.
My only criticism is that I wonder if you're clipping the blacks a bit much.