That is absolutely beautiful, Watson. You mastered the expression and especially the eyes, which can be very hard.
When I took a collage quilt class, I got to see the quilts up close. Laura Heine tends to quilt hers in straight lines unevenly spaced with very fine thread. It seems to quilt them without disturbing the design. I've also seen the very fine tulle used. If you get the fine bridal tulle type, its barely visible.