They look very promising.
I'll give you a little feedback, as I'm avoiding doing work lol.
When you're taking photos of cars be sure to think about its placement, as anything 'growing' out of it can really detract from the photo. So for example the white door in #4 looks a bit odd. Also, I guess that's you in the background of a couple of them? I can't decide if that works, or if it's distracting! The angles are a bit too extreme for me, too.
I like the flower shot, perhaps a little bit out of focus, keep an eye on how close you are to it and bear in mind the shortest distance at which your lens can focus.
The fence post is a nice study in DoF, works well. The blown sky is maybe a bit off-putting.
To help cut down reflections on the car and to bring some colour back into the sky you might want to think about getting a circular polariser or graduated filter, they can be very useful.
Hope what I've said is helpful, its a good first set and I look forward to seeing what else you get up to.. it's an addictive hobby!