How to model into a 2d image?

Question

Ive been trying to figure out how one would start doing something like this

If you didnt have a 3d scan of the model to work around, but only a 2d image of the person, how would you estimate distances etc? Is it all just moving things until it looks right?

And for shadows, I guess youd use a hidden plane as a shadow catcher, and angle it in such a way that it copies vaguely the shape/angle of the 2d image/person?

Thanks in advance

You will have to replicate the basic shapes of the subject which should be affected by the 3D objects through lighting. Related answer. If you have geometry guides, you can use fSpy or other addons to estimate the camera properties. Otherwise you have to eyeball it as you suggested. You don't have to create a perfect copy, using image manipulation software shadow and reflections can be warped, added, reduced untill it "looks good". — Leander, Oct 30 '19 at 12:51
Please provide some context and explanation, don't just post a link Also use a descriptive title — Duarte Farrajota Ramos, Oct 30 '19 at 13:11
After looking around BSE, I found this answer to look something along the lines of what you are trying to accomplish... Maybe try: This answer — anonymous, Oct 30 '19 at 12:26
This is useful, however one would still have to assume the general geometry while creating a mesh out of metaballs. Its more like modelling a basic human using a 2d image as your reference.
Im not sure what exactly I expect to find as a workaround, but perhaps an addon or software that helps estimate distances without me having to model the parts. — tomas2019, Oct 30 '19 at 12:33

How to model into a 2d image?

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