This reminds me of the statue of the greek goddess who is being chased by apollo and then turns into a tree to hide from him, very cool!
I don't usually have good frustration, probably because I work from home and tend to have more time than I have strength of will. That being said a famous author (possibly Hemingway) once said that during a writing session you want to stop while "the well of creativity" is still a little full.
That is you shouldn't write until you have nothing left because then the next time you sit down it's harder to get into the groove.
Perhaps that's part of why the frustration is good? You're excited to come back to your drawing because you still know what you want to do with it?
That's a good way to look at it. I've heard similar stories and advice from authors who always end their writing day mid-sentence. When they sit down the next day just finishing that line breaks the inertia!
I'm going to have to dig up that myth too... I'm still doing a lot of reading and research, and sun lore & mythology is a huge part of the story.
Here we are! Apollo and Daphnae, sculpted by bernigni. My favorite sculpture I've ever seen!
Thanks for the references, spectacular!