Black and white images can be beautiful, but to master black and white photography one must fully understand the concept of grey scale. (start of educational information… Grey scale is a spectrum of black, lots of grey and white, like the colours of a rainbow but in a series of black and white and grey tones. You see a black and white photo is not really only black and white; it is actually lots of different shades and different depths of grey. So when one talks about grey scale it just means the way we measure tones of grey… end of educational information)
When you remove colour from an image you can no longer rely on it to provide interest or a focal point in a scene. This may seem obvious but it can be easy to forget. By doing away with colour we also remove one of the most potentially distracting elements in a photo which can of course work in your favour.