Unfortunately I have run out of slate, and it will take some time until I have it in stock again.
In the picture you can see 2 attempts at “sign material/black”. Both are 0.08 ls, 200mm/s, Jarvist, but the lower one is at 11/8.5% power the upper one is made with 10/8.5% power setting.
But the main difference is probably my better original picture.
and here is my starting material
Definitely a much better starting image, at least his right hand looks more normal and the bird to the right doesn’t look plucked and ready to roast.
Quite a narrow palette so I might give it another try with some processing and one just as it is.
That’s beautiful!
After seeing the first picture, I was about to suggest rotating the blank 90 degrees to scan against the grain, but I see you did this for the final result. 
