Black and White portraits are often the most intriguing. This however will make greater demands on composition.
Black and White photos have greater potential for contrast and with this potential, the composition can in monochrome print allow the viewer to see the colors and hues which they fancy. Several photographers I know have black and white photos I have seen and when some time later we talked about them, I described them in color. They looked at me confused and verified that we were talking about the same photo by discussing the features of the photo’s subject and elements. Seeing a black and white photo in color is not a gauge on whether the photo is properly composed, but something which viewers may experience where exposure and composition are well done.
One of my favorite fall shots is from above the subject as they are seated on a thick grassy lawn, looking up toward the camera which uses the grass and fall colored leaves as a background!
However, since we are on the topic of black and white photos, how can we capture this same stunning color composition in black and white?
First, it is important to have the best clarity possible and this is achieved with a high-end lens. If you are using a consumer level camera which cannot alternate lenses, do not worry, it should do well for you.
Second, work diligently to make sure the focus is absolutely set on the eyes. If there is one thing that must be in total focus it must be the eyes.
Third, some editing may be done to a black and white photo to add color. 
This photo illustration is a perfect example; digitally signed by Chris D. Jones, this photo draws from the contrast of the black and white giving definition to the feathers, the clarity is displayed in the eye and draws your attention with the iris color.
Enjoy!
Foe-toss | LIGHT 