Amazing work incorporating different sections and transitions while still adhering to the prompt. Have yet to see many pull this off the way you did. Exemplary execution on the "Rule of three", and pictures are serene but become almost melancholic when paired with the audio. Curious to know if you are a flute player or flutist/flautist. could see this music being an ost from a minimalist art style puzzle game like Monument Valley. The different sections could reflect and be triggered by changes in the same level.
But sorry for the lengthy response , all in all good work.