It's metal dust. It could be pyrite, mica or actually gold. In this case I use a FIMO brand that gives very good results.Great work, Ramon!
What sort of golden paint did you use?
My method of sculpture is different from that of your wonderful carvings, it is modelled in polymer clay and then fired in an oven. I apply the powder BEFORE the baking so it melts with the piece and the effect is totally metallic. In the case of wood, it can be applied with one of the mordants used for gold leaf