Final answer:
The best method for drawing proportions realistically when dealing with a three-dimensional subject is using a geometric form.
Explanation:
Using a geometric form is the best method for drawing proportions realistically when a three-dimensional subject is in front of you. By setting up solid geometric forms and understanding how light and shadow interact with them, students can create accurate value drawings. Additionally, comparing relative sizes of different parts of the subject with each other helps in achieving proportionality in the drawing.
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