The reason that I ask, is that the core of the PG plywoods is draftboard, which is an MDF type material. The engraves that I’ve seen and attempted (only a couple times) on the ply and draftboard itself seem subpar. Not the Glowforge fault; it just doesn’t develop contrast in the engraves very well as compared to hardwood. The draftboard seems really “muddy” when you get into it.
For an example, I grabbed the bottom-right from your 4-up. I put it into Photoshop and brought the black up just a hair in levels and hit it with an aggressive unsharp mask. I dropped it into Illustrator just to add the cut lines, saved it as an SVG and put it in the Glowforge with a sheet of Maple Hardwood.
I used 1000/100 Vary-power engrave with a minimum power of 20, 340 LPI (which was too much, probably for a very low res file), 1 pass, focus height of .125 (set by the Glowforge PG settings). The cuts were just auto settings.
Now - this isn’t an amazing engraving. It could definitely be tweaked… and I’m sure your source image is larger than what you posted - I brought it into Photoshop and it was about 465px square after cropping. Not a great file to work with - but still, the results aren’t too shabby for such a low res file. I’m seeing engraves from just marking the surface to .04" deep, if the calipers are to be trusted.