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What would you suggest for leaves, bright spring leaves?What do you think about rest of the base?
For leaves ... more of the same, only smaller.
As for colour ... you´ll have to decide that yourself. You have nice wavy grass ... and the leaves colour you´ve already got, could make a summer scene. An autumn scene could have brown/yellow/orange leaves, with more on the ground and fade the grass a bit. If you go for a summer scene, some wild flowers would look great. Even a stone would sit nicely, as farmers would throw stones to a field edge or near an area they cant farm.
The base as is, looks fine
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Plumbers' tow has one more advantage - you don't need to paint it to simulate dried wild grass
I don´t fully agree with this. From what I see here, Id add some colour.
The tree trunk and branches you´ve used do look really good ...what are they? Id find modelling a tree in 1/16 scale frightening. To get acceptable details is going to be a tough one.
Id love to see an image with the figure ... even if not painted. It would give us all a much better sense of composition.