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The focal points brings the eyes of the viewer directly to what you want them to see immediately, instead of the point of the art piece getting lost.

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With implied lines, even though there are no lines present, the eye naturally follows the direction of the painting. Like in the example, implied lines will keep the eyes moving around the canvas.

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In any drawing or painting, it is important to have balance so one side isnt heavier than another in detail, or color.

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Negative space is thespace around and between subject(s). It can be used to help with proportions, or be the focus of a piece itself.

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negative space art definition - Google Search

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With rule of thirds, imagine a 3x3 grid on any painting or picture. It is kore appealing to the eye if the subject is not in the middle, but up in a corner, or above the top line and more to the left or right. As seen in the example.

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rule of thirds in drawing - Google Search