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I would like my models to be of high quality and look lifelike but they always end up looking very low-poly and basic.

How can I improve them?

My models currently look kind of like this: https://sketchfab.com/3d-models/low-poly-farmer-man-08ccb9a009a34ca5916866149e5b51a3

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But I want them to look like:

https://sketchfab.com/3d-models/keen-casual-sitting-man-in-jacket-and-jeans-e500267d45b34776be3ef3e709f3cd6e