Stephanie Lee introduced me to plaster some years ago with her book Semi-precious Salvage. It contains a fairly simple method of mixing and casting plaster (like the bird head in the photo below), that worked like a dream. In later books, she showed how to use plaster cloth.
While browsing in a bookstore I came across a piece in someone else's book (sorry, I didn't think to write it down), where she talked about using plaster cloth this way:
If you like texture, this is one way to go.
Simplicity is the removal of the useless and the unnecessary--source unknown