In addition to the piece just shown, I've been working on this a good while juggling both projects in each of my different work locations ( One in my mountain home, the other in my studio at the base of the mountain.)
The first question... threads... I used only 2 different threads as I wanted the drawing to keep center stage... quilting's job was to help showcase the story already told. Enhance... don't distract... is my goal!
The plan: One white 40 wt thread ( a hair warmer white than the base white fabric) would appear in open white areas. The minor value change in this thread value will help the quilting visibility without saying " I'm another color!"
One very fine clear monofilament to quilt where needed, but NOT really seen much. This would predominately be in areas where pointillism (small dots) were used.
You can see both uses here... the hair and face of the warrior on the left is all in monofilament... just doing the job of securing the quilt sandwich where called for. The warriors face echo and breath is quilted in the slightly off white thread. There rest of the bubble fill is the chest/body of a buffalo.
Iron heat to remove markings and show the result.
I have more to do but you may have accurately concluded I am quilting from the inside (center) outward.