Hi Tobias,
I am not really sure, but I’d say that procedural textures can be used, as long as they are not too complicated (because Eevee isn’t very smart and has problems with difficult, or large amounts of calculations (it’s GPU based)). Your shader should be fine.
However, I watched the ghibli tutorial today and it seems to me that that is heavy geometry, it looks great, but is it low poly?
Keep an eye on your Vertex count, there are about 50 parts to be made (without the back and interior) and if one bush has for instance100.000 Vertices (I don’t know how many you have), then that is actually quite a lot imho.
Now with nature in general, it tends to be rather hard to keep the Vertex count low, so we must be clever here (I’m not sure how to tackle the (my) grass either…).
Don’t give up until you are convinced that you can’t get a (significant) lower polycount 😉
Luckily we still have a few days to go 🙂
