Switch to the Smudge Square . Do not add new colors yet. Use the smudge to pull the shadow edge into the midtone. This creates the “terminator” softness while keeping the cast shadow hard.
Return to the Opaque Round . Turn the size down. Add smaller plane changes (the dimple of the chin, the corner of the eye). sinix photoshop brushes
As Sinix himself says: “A brush should help you make decisions, not avoid them.” Switch to the Smudge Square