Thin lemon wheels on top of baked chicken or fish is fine, the juice and oils seep out of the lemon during baking, so a thin wheel provides more surface area than a wedge.
I don't really know what is going on in that picture, but the most egregious thing to me is the giant awkward chunks of mozzarella. You couldn't do thin wheels of mozz? You're gonna make Gunty eat around two huge awkward chucks? It's not a slice, not a wedge, just random n-gons of cheese.
Edit: I didn't know people made rose petal slatko - I've only seen it done with grapes.
Still, the idea of chomping down on a raw random garden rose makes me gag.