Only if it gives the impression of having no color (i.e. contains only shades of gray which can include pure black and pure white)
Free subject any kind of color works: Still Life, Product, Objects, Music & Dance, Food, Fine Art, Fashion, Conceptual, Beauty, Abstract, Science and Research.
Seascapes, Panorama, Nightscape, Mountains, Macro, Landscapes, Underwater, Trees, Star Trail, Flowers & Plants, Birds, Environmental, Astrophotography, wildlife.
Any kind of Travel Photography, Trip memories & Adventures , Street Photography, Documentary, Photojournalism, Daily Life, Culture.