This is a grid based on the Fibonacci ratio of 61.8% instead of the rule of thirds. There is one for each of the default document sizes.
These are guides using the Fibonacci Ratio instead of a rule of thirds.

You can use the horizontal lines to place your horizon line, or use the intersections to place your focal point.
I have included a grid for each of the sizes that are commonly used in Clip Studio Paint, plus a custom size of 14x18 inches, which I use for personal work.
Composition
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1920x1200 Golden Sections
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1600x1200 Golden Sections
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1680x1050 Golden Sections
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1280x1024 Golden Sections
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1440x900 Golden Sections
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1024x768 Golden Sections
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800x600 Golden Sections
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B6 Golden Sections
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B5 Golden Sections
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B4 Golden Sections
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A6 Golden Sections
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A5 Golden Sections
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A4 Golden sections
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1920x1080 Golden sections
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14x18 Golden sections