WIP2:
I tried to Bake the model above but it uses the shader to rdb node which will only work in eevee. So it can’t be baked, because baking works only in cycles. There is a option to use the toon shader in cycles instead, but it diden’t give me the same nice result.
I’m not sure if i can store the colors in a indirect lighting map in eevee, did a short test, but it diden’t gave me what i want.
So i guess this shader is in realtime and procedrual and not backable to a texturemap. Maybe this will be accepted for the entry.
I already started a second approach to the bushes, with geometry moddeling a leaf.

Dosen’t match the stile yet, but looks promising. Also tried geometry nodes for distribution. on a sphere and procedrualy on a line.
But i’m not there where i want to be yet.

Also a simpler variation with a lowpoly plane, single color texture
I baked the color and combined it with a baked shadowpass, but texture ist quiet blury at the moment with 1k.
The right bush is with baked textures and left with principled bsdf.
room for improvement.

I think i should focus on the modelling for now to get the shapes right , and then come back tho the shaders, although
the shaders depend in the modeling technique a lot i guess.
My favorit is the Gibly Style in post 1 to focus on.