I wouldnt worry about focal depth at all sense you just have a point and shoot. even if you did have a fancy camera to take that first pic and that street sign was blurry, it still takes up too much space in the picture and it draws a person's eye to it instead of the car.
personally I dont think your distance from the car is all that bad sense you're trying to show off the S bend (tho being closer to the car wouldnt hurt either). The issue is the angle of the car - you're showing too much of just the front or rear, you need to be able to see a lot more of the side. that would make your car look bigger and take up more space in the picture while still showing the road. I'd also recommend angling your car in the road instead of it looking like you were driving and just stopped. either angle it in the middle of the road or just in your lane.
That third pic i think is a good angle of the road, the car's just sitting in the wrong spot. if it was driven a little farther forward and angled more to the left or right with the wheels turned itd look better. just my opinion tho...
The last 4 pics i think are fine. The one of just the front of your car and the honda on the wall works cause the viewer gets a sense of symmetry. that crz just throws it off a bit.
I've thought about taking pics on the road before but was worried about traffic. I'd recommend trying to get a friend to go with you. have them drop you off on the side of the road and then come back and tell them where to stop the car. Then they can duck, you take some pics, and then yell at them to start driving again when a car comes. I haven't done it yet but I'm planning on getting my gf to help me do that sometime cause i know a few spots I'd like to take pics on the road.
You could try looking at
mine or
Raymond's flickr accounts to get a sense of angles to take pics from. Raymond shoots with a wide angle lens which helps his look better than everyone else's. I wanna get a wide angle lens eventually but I just don't have $600 lay around haha.
...just trying to help. next time you take pics can you take one directly from the side of the car, showing the whole car? i'm still wanting to see how that roof spoiler flows with the rest of the car