To dust.

[H[a/o]llowheart]

Marionettes march until sandpaper veins chisel through their kneecaps.

[Magpie]

Hi, I think this would read better with line breaks.

A possible suggestion -

Marching marionettes -
sandpaper veins
chisel through kneecaps.

Also I would consider changing chisel as it is a very specific verb and it doesn't seem quite right here.

I do like the image as a whole.

Mark