I'm still not happy with my work. I don't think it's so much the actual stitching, but there is something lacking in my prep work. Try as I may, I cannot get the curves so smooth. I end up with points where it should be a smooth edge.
I started buying silk threads years ago in an attempt to improve my applique skills. I have several spools of Tire thread and a few Kinkame. They are both quite nice but expensive. I then discovered YLI silk thread, It is the worst. It shreds after just a few stitches and I'll never buy that stuff again. I have even tried a single embroidery thread. I have lots and lots of those. But they shred badly as well.