Here is the pattern for my butterfly. It's all Knots and Bullions, with a Stem stitch outline (I'd do it thicker if I did it again, more significant), Satin stitch pink spots with Stem stitch outlines... It's all written there on the diagram.
When I say Velvet stitch, you might know it as Ghourdies or Turkey Knot? I can't see a suitable link else I'd conveniently and typically, helpfully and (always) happily give it to you.
Make the Knots FAT and many-wrapped, using all 6 strands and keep varying how many wraps you do, you know... 4-6-8. Something like that.
Show me if you do one! I get all alone and lonely if you don't share.
You probably didn't notice, but I've missed a bit. Not on purpose, I just didn't notice and now I don't care.