What's fascinating about Athitzi is that there is absolutely nothing to it and yet is spectacular. It's all in the shading, of course.
It's just lines…lots of little lines or long lines as you wish.
It would, you think, take a lot of time but if you keep the size reasonable, not really. The examples given in the challenge were layered..so like another shape behind this one with more shading.
Fun fun fun. Nice illusion. Lots of creative opportunity.