Sculpture is one of the hardest art medium to mast with realism and most sculpture don't even really look like the muse as much as a drawing or painting can ...but sometimes these muthafukking sculptures don't even try to get likeness.
You can do a CAD and 3D print the sh't nowadays.
No excuses.
And at an elite level, every medium is extremely hard to master, you made a non point there.
It'd be just as hard to achieve a Cindy Sherman photographic portrait as it would be to paint an Albert Oehlen abstraction as it would be to paint a Kerry James Marshall rococo vignette as it would be to come up with a Pope. L performance as it would be to create an Arthur Jafa video work and as it would be to make a Simone Leigh sculpture...
It's all pretty fuccin hard to master, and there are very few masters in the world, especially now.