Yasss! This was fun. I put a little drawing of a brush next to each exercise so that I can see where I hold the brush and what part of the bristles I used. 

I realized i tend to grab the brush by the ferule when I start shaking and want super precision, but I'm practicing to grab it properly now. Funny thing, I actually feel like grabbing the brush by the tip, made it possible to create smoother curves, therefore my circle was nicer than with the middle and beginning of the brush. I tested afterwards my theory and painted some waves and I noticed that, indeed, the waves made with beginning and middle grip have sharper turns making it more squarish while the waves grabbing with the end of the brush have softer transitions.

Thank you teacher for another great class!