3rd and final attempt - I painted this one on a block of Daler Rowney The Langton rough paper (300 g/sqm). The previous attempts were painted on a lighter cold-pressed (fine grain) paper (Canson 200 g/sqm), more suited to precise wet-on-dry painting. The rough paper works better for the grainy textures.
That's it. Onwards to the next project! I might frame this one.