When you say greenstuff skulls what do you have in mind? Do you want perfect skulls or more broken/mutated skulls. Because in my opinion there is some serious differences in tools and skills between the two. For example, to do faces/skulls within a mutation (more like a slaneesh style) then I use a product called oyumaru, which is an instant mold. the benefit of it being a mutated part of the weapon/item is that it doesn't have to be a perfect GS cast as you can just blend in the edges. You can do a perfect skull using oyumaru, its a bit more complicated, but once you have the hang of it its reasonably easy to repeat. The main difference is you can't simply hide any bits where it didn't form very well (although you may like them more broken). Do you have any photos of the model in mind? would be useful to see it.
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