Love it. Thank you for always trying, even when the ADHD task-resistance kicks in. You could easily let it become tenacious opposition but you don't. If there's anything I want to give you it's that if you fall in love with the process and it will exponentially improve your products (which are already great, by the way).
Everyone is encouraged to re-read pp.46-48 in 'Drawing on the Right Side of the Brain' and repeat this exercise as often as you want to to build both your perceptual skills and your mental L-to-R mode shifting skills. Everyone is also welcome to re-submit this assignment (decorating, filling with zentangle, expressing & interpreting the positive & negative spaces of the vase/face illusion) for a higher grade before the end of the semester.