This turtle I actually drew on a smaller scale around 2 years ago :-) I felt it might have been have hindered the quality of the project trying to create a new piece whilst juggling trying out this new timelapse method. So I went with an older drawing I fancied doing on a larger scale and created it to fit with the song, drawing the parts that reflected that moment in the music... (This wasn't very clear in the post, so thank you for raising the question!) So I always start with the eye, then imagined the little patterns around the eyes emerging to the "tinkles" at the beginning of the song and had the dark netted part kind of "blurt out" as the music descended (wow, it is a lot harder to explain this in words than I thought!) The next step I'm now working on is combining the two and creating something brand new where the whole piece is based on the piece of music :-) It took around 3 months to finish this one, so I'm not sure how long it'll be until the next one's ready! But I've made a start.
There's a timelapse I made in a similar style featuring a new piece I freehanded straight to the wall, so all is possible! I've used the same basic outline for previous elephants, but not the same design :-)
And thank you for taking the time to write out such a thoughtful reply by the way, it's my pleasure to extend the same courtesy back to you. Followed and look forward to keeping in touch in future!