Done this today on site.   Did this location earlier in totally different light couple weeks back.   This morning light was coming strongly from the left.   The other thing was I FORGOT some of my main colors OH!.   Had no Alizirin Crimsom and no Cadmium red.   Only red was Venetian Red and Transparent oxide red so was really hard to make a good dark.  But I made do.  That and the wind blew my setup over once so there probably is some grass inlaid in here as well!