Salt!
Next up is a salt layer and another darker shade of grey/black.
So I finished cleaning up the masking then coated her in water before grinding coarse sea salt over random areas.
The salt/water was dried off with a hairdryer to speed up the process.
Then a darker shade of grey was added and when dry, the salt was then brushed off.
And here’s the overall effect from above
And then repeated for the bottom