Dear ZBrush community,
I’ve just discovered this beautiful platform, with so much depth and versatility, and after a few tutorials I see multiple ways to solve a few problems I have, so I wanted to ask for quick advice from your personal experience which you think will be best.
I am working with 3D scans of plants, from photogrammetry + projected light.

There are 3 challenges in particular. (1) is noisy edges on the leaves, which are in reality smooth curves:

(For the above, it’s worth noting there are actually two surfaces slapped back-to-back, with two different noisy edges; the ideal processing technique would be able to erase / smooth both in one swoop.)
Just guidance on above (what type of brushes you’d try or recommend, e.g. topological, trimming) would be great.
The other two problems are (2) need to elongate meshes representing the thick cylindrical stems of leaves, where currently there is a gap between the leaf and stem; and (3) need to stretch the thin flat surfaces of leaves, to cover the holes on some sides of them. Ideally, one or both of the techniques applied would be able to somehow extend the topology of the patterns missing - although I don’t expect this to be easily possible, any guidance in this direction would be especially desirable.

Thanks everyone - any feedback however obvious or basic is really helpful.