Hello John:
I have painted this famous 1:16th Tamiya figure, but some years ago. And
you have really done a fine job on this one, John. I'm sorry but I'm not
familiar with the word pinwash. But you're off to a good start. And since
you're going to add dust and grime to his uniform, to make it soiled, I
suggest you make your base reflect that same kind of dusty terrain.
Good luck,
Miami Jayhawk