I also used the liquatex acrylics and followed Pandatrooopers technique and was really happy with the result
But I ran into trouble when this was knocked back for being to dark and not enough orange tones. So I cleaned it off and tried another technique the second time around. I made 2 washs from the liquatex acrylics, a red brown and a darker black brown. I dabbed the Red Brown on with different size brushes and then dabbed off again with a clean rag, then built this up over a number of passes. Once dry I did the same with the Black Brown and then finally added some pigments on my chest/ab piece