Please consider the possibility there is no problem here at all

There is no incorrect value for focal length. The term does not apply. Various focal lengths are common through the history of lenses. Our eyes have no such parameter, because of the way they work but are considered to be close to 43-45mm on 35mm sensor by many, but most natural perspective is debatable and you can find people considering anything from around 25 to 70 to be natural. It depends on the subject observed as well.

People are used to various focal lengths in pictures. This will not be considered a problem by vast majority of your artwork observers and does not contribute much to the visual communication in this particular case. It is very common to see people this way for everyone, because this is the only way we do see other people - once we get further away perspective of the face changes in exactly the same way. Your worries here have no logic.

In fact in portrait photography 'less perspective' is often considered to be desirable. It is common to use 50-85 mm lenses to make faces look more like the image you marked as a problem.

I suspect you are overthinking this and wasting your resources(time) trying to solve this 'problem'. I would suggest looking at your model from various perspectives while modelling/sculpting and adjust it as needed the way you like it if you must, but accepting that it's going to look a bit differently from different distances because of how physics work.

You can change the "camera size" in properties object camera to enlarge your image while keep all light angle stay in place:

This is the thing that every photographer in real world want to increase, you can do it in Blender for free. Thank you, Blender.