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A friend of mine came to me for advice on how to convincingly age a wall of a doll's house with moss, ivy, and green stains etc, as she knows I collect and paint 40k, and thus have prior experience with scale modelling.
My issue is that I've never gone anywhere realistic in any paint schemes, I very rarely paint for anything better than tabletop quality, and so I come to you, the Dakkaverse, for your accumulated experience and advice.
Websites, YouTube tutorials, supplies etc she'll need would all be greatly appreciated! They are a complete beginner to this, so please assume minimal to no supplies to hand.
Many thanks in advance! UK based

Bury it in the garden for a week...

If they want to dabble in what might be a bigger hobby, here what I'd recommend for low investment, high impact stuff that can order online or find with a single local stop.

The easiest way I've seen to do climbing vines is a wandering line of PVA glue (Elmer's) and a sprinkling of colored flock, synthetic foliage, or even dried herbs from the kitchen. For moss and lichen I'd sponge on a few different gray-green acrylic paints with a natural or kitchen sponge. For general weathering, add more acrylic paint to the purchase, maybe a burnt umber and an unbleached titanium (off-white), and a couple of cheap 1" brushes. Drybrush light surfaces with darker paint and dark with light.

Next level: sand and prime the whole structure white, hand paint in neutral acrylics, weather as above, and add vegetation. Whatever level of detail they go with, clearcoat the whole thing at the end, especially if it's going it's going to get played with.

Sounds fun!