Oh quite the contrary. I think the depth of field needs to be very narrow and I think you've accomplished that. The first image with the car is a great example. The near side of the car is in focus, along with the immediately surrounding grass, but the fence and building are out of focus. It could be a bit narrower depth of field but it really isn't necessary. I wouldn't make it deeper, that's for sure.
If anything, I would work on using a lower ISO to produce less grain in the image. Because lower ISO requires more light or longer exposures you might need a tripod or a remote shutter if you aren't already using those. Though your images don't appear to have
any motion blur so I suspect you're ahead of the game there.
Get that ISO to 100 and you'll be golden