Shapes, perspective, background and texture in B&W
Take Shapes into Consideration
Since black and white pictures lack color, they are dependent largely on lines and shapes to create interest. Try to incorporate a variety of shapes that create different types of lines such as curving lines, crooked lines, or slanting lines. Stark straight lines can also have dramatic effects in black and white photos.
Mind Your Perspective
Perspective can create some very interesting effects, especially in black and white photography. Perspective can bring alive a standard subject, it can suggest depth and mystery in everyday objects, and, in fact, you can make a picture tell a story just by using an unusual angle while photographing a scene in black and white.
Take Care of the Background
While taking black and white photos you need to make sure that the subject does not get lost in the background. Often, just by shifting your subject a little to the left or right can help in eliminating unwanted elements in your photograph. Or you could try to take the picture from another angle.
Texture can add interest and definition to black and white photos. For example, a black and white picture of a roughly textured wall will certainly look more interesting than a smooth wall, or a road made of cobblestones will look more dramatic than a smooth one.
~Rita Putatunda from her article Tips for Shooting Black and White Photos