When I was new to quilting I was firmly informed "that not quilting its embroidery because you have used more than one color of thread".
Well in the latest panel I used light blue, variegated green, green/black, grey. I changed color according to the area of the panel because i did not want to add more colors to the picture only texture. I have done some work with transparent thread but I find it a bit temperamental and inclined to stretch and snap.
The panel on the left is before quilting.
The panel on the right is after quilting in late after noon sun light to show up quilting lines.
The panel below is the panel in normal light.