In old art books the publisher would often save money by printing some of the art in black and white. Color printing was unbelievably expensive for a while. Since the dawn of digital printing, that has not been so much of a problem anymore.
For the artist, though looking at their art in black and white can be telling of success of the finished piece. Great art should have a range of values: tints and tones.
Tones are colors adding black. Tints are colors adding white. If there is direct light there should be a pure black spot and a pure white spot. If not, tints and tones are all the more important.
Black and white also helps you to see the contour and contrasting shapes in the piece. Study this for interest. If the whole of the composition is too symmetrical, it will usually look off. If all of the shapes are perfectly geometric, the piece could look boring and stagnant.
For me, I contrasted the oblong, organic apple with the man made plastic jar. Of which the apple is sitting.
Desaturate your image and study it. See if you can find the features I pointed out here.
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