I was writing this answer for some other recently asked question but it was closed later for being duplicate, so instead I'm writing it here.
Although not sure about the technique used to achieve this but I think it's quite not impossible to achieve similar effect if you can spend some time in Photoshop. Further you'd need a lot of masking and separate layers, especially for visible body parts which are dark, like hair, mustache etc.
The technique I'm going to use is gradient mapping and can work better for visible body parts if:
- Image has high resolution
- Hair and mustache are not dark (in my example hair were black, so I had to do separate adjustment for hair and eyebrows.
All other stuff, like clothes, objects are relatively easy to approach for this effect, but again you'll have to separate them into different layers if they have color differences. For example, I've separated trouser and shirt as they had different colors and it would be difficult to use same effect layer on them.
- First of all, separate measure components of the photo like trouser, shirt, face and hands.
- You may want to adjust contrast/brightness or Levels of the photo a bit
- Add a Gradient Map for each of them. You'll need to adjust them for each layer. Here are a couple of samples and Layers preview:
- Do hair and eyebrows fixes by adding another gradient map on the top and masking (you can create separate layers too for them, if it's easy to mask them)
- Add any photo filter layer on the top (used to make the overall look a bit yellowish/warm)
Further, final result (sculpture look) also depends on the objects inside the image, type of clothes they are wearing, original contrast and lights etc. For example, I would also possibly remove the tattoo on the hand of the guy.
Image source: https://unsplash.com/photos/9QW52RyBLao