>>3945507>the fundamentals didn't help Proko draw a kangaroo
The fact that Proko couldn't draw a kangaroo from imagine illustrates the sharpening of the axe analogy very well. Drawing animals and drawing humans are two separate subjects, two separate axes to sharpen, and you'll only know how they relate if you study both which Proko didn't.
Its clear he didn't spend any significant time sharpening his axe in preparation to draw specific animals from imagination by drawing and studying them, only humans. Thus he was clueless about how to approach drawing an animal from imagination. Sure, you can say that animals have similar bones and muscles to humans but how would you know whats the same and whats different if you havent studied both in tandem?
Hell if he even just drew a kangaroo from a photo before that stream he would probably had enough knowledge to draw an acceptable one from imagination. It was clear that his mental image of what he wanted to do was so incomplete that he didn't know how to apply what he learned from figure drawing over to it.
I can draw human figures pretty well, acceptably even from imagination, but if you asked me to draw a random animal from imagination that I hadn't seen in a couple years then I'd probably a lot of trouble translating that mental image onto paper because my memory of it is so vague. Ask me to draw a cat, dog, horse or a turtle then I can probably do that well because I've done that a lot already.
Vilppu can draw animals so well from imagination because he's drawn all different kinds from observation and from photos, and has great knowledge of their anatomy. He didn't acquire all of that knowledge by drawing human figures exclusively like Proko does.