Hi; seeking recommendations for case-study levels

Hi M.Fans

I fell across Mekorama after completing Monument Valley, also quite cool though this is far better as you have so much more potential. I completed the first 50 levels pretty quickly and am now hooked on self build... BUT, I'm still Very much a rooky. So I thought I'd start a thread for some recommendations:

What are your top 3 levels that you would recommend a novice builder should study and why?

Feel free to try out my first attempt and pass judgement.... (Be gentle )