This is amazing. It looks futuristic while also being very reminiscent of its (history-based fictional) time period. I like how the man's just standing there, looking casual about it. He sure likes his car, sure, but it's not amazing or otherworldly like it is to us, because that's normal for his world. It kind of looks like what Jay Gatsby's car would look like if The Great Gatsby were rewritten into a dieselpunk setting. (Hey, that's an awesome idea, now that I think about it...)
Also, I don't know if you know about the website TVTropes, but it has an article on dieselpunk (link takes you to said article), and there's a picture of your piece on it. That's how I found out about it. Anyway, amazing work, and I love stuff like this.