I might get flake for saying this but since the digital age of photograph and the hi-tech things cameras can do I think the term "Photographer" has lost it's meaning somewhat. I'm not a Photographer but I like taking photos. I point and shoot and they come pretty darn good as far as quality goes but what makes the photo is the subject and the "eye" the person taking the photo has. Mike, you have a good eye, so in my book you're 90% there.
I dealt with graphics as part of my job at HP when I worked there in a previous life and I learned pretty quickly that they call it "art" because it's always subjective. I would do some graphics for a product and give marketing three or four versions to choose from. They rarely ever picked the one I liked the best, but eventually I was grateful that they picked one and we moved on.
Point being, I like your photos, and I like the one with all the concrete showing and I can see why others wouldn't like it... we all have different likes.
On a side note, do you have a cover hanging down under the front of the car?