Engraving a photo outline onto acrylic

I have been engraving acrylic lately in various ways. Sports logos, messages etc, initially as raster key rings etc, then I moved onto vector engraving onto larger pieces. What I really would like to do now is to engrave a photo onto acrylic as attached. Any idea on how I go about starting to get this effect form a photo please?

Hey Mark,

There is no quick fix for this (I have tried!)

You basically need to trace the outline. Quick yoitube search will give you examples.