How do I use box cutter to cut indents into character face like this image

How do I use box cutter to cut indents into character face like this image

Or is it better to use decal machine?

Looking at this image, it looks like it might be a normal map, not an actual cut. I would not recommend trying to make an actual indent in a character. The complex, rounded topology of a head would make an actual indent a nightmare to do without any artifact, you would have to model the edge flow around the indents or manually fix every individual polygon around each cut.

I just looked up decal machine and it looks like it could do it, though I can’t find if it would work on a deforming surface like a character.

Honestly, an actual texture is probably the best and most reliable way to do it on a character, especially if the face will deform in any way.

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Thank you- makes sense

Just a noob here, so I don’t know a lot of Blender details…

I would -
Create a stincil/cookie cutter shape that would create the outline shape - I.e. a cylinder with no end, deform to correct shape of the indent line.
Solidify to width of the line - apply modifier
Push it into the face where you want it to go
Do a boolean difference on the cookie cutter to make the cookie cutter match the face shape.
Now to extrude it to the depth of the indent
(or Extrude the surface exposed by the boolean but to zero distance, then GRAB or SCALE, whatever works, and drag the appropriate distance.)
Push it back into the face and do a boolean difference on the face.
This should produce the groove.

The oval small indents would be even smaller so simpler like this.

If you already have a line that follows this score mark on the topology, then bevel the line slightly (to 3 or 4 lines, but thin) and select then GRAB or SCALE the center line(s) of the bevel so they indent.