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Single point perspective:
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learn it if you havent
- draw it but put the dot almost on right side of the sheet
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Simplifying:
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make the characters and everything else a box, it helps with perspective
- there are several references for the right boxes for ppl
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Ratio:
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learn the ratio of human bodies
- ofc they are different with foreshortening but you can go to a mirror, pose and take a picture to study those
Hope that helps