Honestly, mushrooms are pretty much indifferent to light. They're the fruiting bodies of fungi hidden below the surface anyway, so don't have much use for sunlight either way (except secondarily, because what the fungi are feeding on often does rely on sunlight to exist - trees and such, say), and they often don't last very long given all they're doing is distributing spores into the air.

Of course, magical-land mushrooms might feel differently about that!

Dee-licious! 🍳

Delicious! And spider-meat "bacon". Now where's the frying pan? 😁

That's really nice! And obviously a lot clearer!

The tree-rings discussion has made me wonder if you could simulate the look of tree-rings within the trunk as a drawn polygon using the Edge Striping Sheet Effect. That would need a specific pattern to be available in the catalogue of such items, but it would follow the edge of whatever polygon was drawn, which is clearly a key aspect to the design. Someone better-versed in such things than me could doubtless advise more usefully on the practicalities of that though.

I agree the Sd 222 looks too dark. Rusting and damaged is fine, but it still needs to be seen when used on a map.

Classic problem when painting miniatures for tabletop wargaming too; too realistically camouflaged and you can't find them among the vegetation, etc. Always a degree of compromise involved.

Don't know quite what it is, but the Sd 222 always looks like a "Doctor Who" Dalek to me...