Annie
I posted the design file here
I recommend scan after downloading
it takes some time to open the file with all the blending paths with bevel (at least on my computer some years old I see the effect going on )
design filethe outcome depends on what first line you draw stroke width color and the transparancy you give your strokes
I use a different transparancy for the first blending path I make
it has a lot of possibilities starting with one simple line
after finishing the blending paths I selected all the lines and used a bevel effect
if I am correct
width 2
contrast 0,3
softness 0,2
profile linear
light angle 135
you can see in the design file