I know komotar mentioned that you should go lighter on the shadows, and I agree. In order to get a good result for any painting, drawing, or charcoal work, you have to use the space efficiently and more importantly, WELL. That doesn't necessarily mean to use heavy darks as background, but a lot of people, myself included, fall into that trap when we don't know what to do. Your later drawings look better, but the use of space isn't particularly good and your proportions are still quite off, especially in your car drawings.
After this topic got dug up, I decided to have a go myself, as I haven't really drawn anything in about 3 years (since the last art class I had). I know this has quite a few flaws (the right-hand side of the car is out of proportion...too upright, and doesn't keep a constant vanishing point, but it does demonstrate that it is possible to get to the point where you can draw reasonably OK stuff using basic drawing techniques no matter whether you're using pen, pencil, or paint. I drew it in about 1/2 hour using a plain Pilot gel-pen, nothing special, and no erasing:
I would strongly, STRONGLY recommend sticking to pencil and charcoal for a while, they're far better media to work with for most things than pen.
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