It is a wonderful piece and I sure can identify with your quilting decisions. I would trace this and draw in thread painting lines to have a really clear idea of direction for all parts. Once you begin thread painting it is so easy to become confused as to "where next?" I would use several different black/ grey tones to paint with. The background... I agree with others that a vertical elongated stipple that isn't as dense to follow the grain. Good luck. I can't wait to see the finish. Your work is always great.