Draw the outside line of the knot. Erase the center and redraw the parts so they appear to weave over and under as in the finished example.
GIF - 32.2 kB
How to draw Celtic Snake Knots. Great tutorial with using string to help. Good for ribbon animals.
4. Lösungen - Celtic Knotwork: the ultimate tutorial
Celtic Knotwork: the ultimate tutorial
Creative Doodling with Judy West: How to Design Celtic Knot Patterns
Form drawing Waldorfschule Klagenfurt