monochrome

nouns

painting done in a range of tones of a single color
monochrome
is a type of (narrower)
graphic art consisting of an artistic composition made by applying paints to a surface
"a small painting by Picasso"; "he bought the painting as an investment"; "his pictures hang in the Louvre"
painting, picture
a black-and-white photograph or slide
black and white, monochrome

adjectives

having or appearing to have only one color
monochromatic, monochrome, monochromic, monochromous