I took a look at the screenshots and I think I understand the confusion here, the face structure does not change in the slightest, what’s really going on is a different field of view for the camera, in games (and UE4 by default) it’s usually 90, with the option to ± 15 or 20 it via settings, but in film the camera is more around 50 or so, this reduces the fisheye lens effect. The pictures on that store page were probably taken with the cinematic camera actor usually used for cutscenes and stuff, while you look at the same character with a default camera, but the character itself does not change.
EDIT:
After a coffee, I also noticed that on the 3rd screenshot a thin yellow outline can be seen, this implies the following procedure if you want to get the exact same result:
- create a new map with the default sky
- place them like that in the level viewport
- in the viewport, click on the little arrow button and change the FOV (optional)
- press G to make it in-game (hides editor icons from the viewport)
- press F11 to make it full screen
- press Print Screen to make a screenshot