What are half tones in a drawing for?

Halftones are a part of drawing and thus they remain even when the color is removed. The little numbered arrows point to some of the shadows on this head. For instance number 6 indicates the mouth, a cavity that the light doesn't illuminate, and 5 points to a shadow cast by the ear

Explanation:

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in my opinion, and this only my opinion, not everything needs to have two people kissing to be romantic. yes it , but why do we have to have people kissing, and long walks on the beach for it to be romantic? yes, these are common characteristics of romantic, but we need to look beyond that.

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