Hi! Welcome to the forum.

Since you've posted your shots in the critiques section, I'll be going out of my way to give you some criticism you hopefully can use. So please don't start off by thinking I don't like your work. Here we go...

First shot.
Somehow, I get the feeling it is out of balance. The left buildings lean very heavy on the shot and is giving me the feeling it's tilted. Maybe a little rotation can fix this. Maybe it's just me being silly.
You've done some great work with the lines here. Everything seems to be pointing towards the horizon. Too bad there's nothing to see there. It would be really great if there was something there to look at.
I can see you've done some manipulation. If you look closely at the sky, you can see some halo's around the edge of the buildings etc. It's not bad, but if you look longer to the picture you'll notice it. Also, I'd probably tuned up the brightness just a little here.

Second shot.
I'm not sure what you want to show us here. I see a lamp and a damaged wall. Which makes me wonder what caught your eye here. Why did you think this scene is worthy of making a picture off? I'm not being negative here, just really wondering. Maybe if you tell me, I see it too. Otherwise, maybe I can give some advise here. Technically, this shot works perfectly for me. Nothing to add...

Third shot.
That beetle is a real eye catcher here. It's nice and sharp and the background isn't distracting at all. I quite like it! However, you've left it some space, but at the back of the car. I'd rather have a little more space at the front of the car than at the back. But I wasn't there, so I don't know what's in front of it...

As for the B/W conversion, I'm a big fan of very contrasty B/W photo's. Don't be afraid to tune the contrast up more than you're used to. Most of the time, it looks quite nice. But that's just my taste...