Technical issues aside for the moment, your work has potential, your composition in the first, third and last is pretty good. The second (green thing) and the first "No Hunting" if flipped might not look too bad except for the obvious. You really do need a macro lens for that type of water droplets, that will let you get a lot closer. We read from left to right and when a dominate subject is right of center it seems to have less appeal. The excitement factor in most of these is pretty low. With a moving car if you pan your camera with the car and use a fairly low shutter speed like 60 or 90 the car should stay sharp and the background blurred giving the feeling of speed. Something like that might raise the excitement factor a few notches.
Technical issues are numerous, I would suggest some basic photography books and become familiar with the proper terms. Focus is an issue in some, it appears you may have shot through a window or windshield? If so that might explain some of the fog. Or was it a foggy day? ISO refers to the light sensitivity of either film or your digital sensor. With film it is fixed at the point of manufacture, with digital it is adjustable in each frame. A higher ISO with film means more grain, digital more noise, but less light is required for the proper exposure. There's more but I hope this little bit gets you started. Please post again soon.