The original model was made by ChaosCoreTech in ZBrush. This kind of software is ideal for sculpting models with high-level tools, but the resulting mesh is not clean, intersections of different parts can become a mess.

There were several problems with the geometry of an eyelid, the eyebrows and the intersection of the pants and the jacket. All of them have been repaired.
In addition, the center of mass has been improved by increasing the area of contact with the ground by 20%, improving the stability of the piece when standing it.
And I have also modified the geometry of the belt to make contact with the pelvis.