Nokia 6120 classic and street photography

[abah kana]

Hi, DPS members.
I only started to have interest in photography a few months. DPS is such a great resources for me to learn more about photography and improve my skills. Since the only photography equipment I have right now is Nokia 6120 classic, not all the techniques are applicable to my situation.
Composition seems to be the only key word I can recall whenever I take a picture. After taking some pictures I think I can make the most out of my Nokia in street photography, and I like it better when it's in black and white. But that's where my confusion starts, how much bright and contrast is enough? Is there any general rule I can follow when I convert my pictures to B&W? By the way, MS Paint.Net is the only application installed on my laptop, so no fancy tips, please.

Here's my personal favorite so far,



Please, let me know how to take better pictures next time.

For more pictures I took with N6120c, please check my flicker
Flickr: iwan purnaman's Photostream

Thank you.