Until now, there was a problem with my model. Maya crashed every time I applied 'Smooth'/'Smooth Preview' to the model, and I couldn't figure out why.
And today everything has been finally fixed.
It seemed that the program had a hard time applying smooth because the 'face normals' were disorganised.
The green lines showing the face normals should always point outwards.
Maybe I shouldn't have stitched the eyeballs to the body.
The model gets scrunched up around the eye socket when I apply 'Smooth'.
The 'Soften Edge' tool seems to do a better job cleaning up the model.
