I've learned a couple of things already:
First, I've finally let go of the left-hand magical envy. I've longed to be a left-hander. I silently would look at my hands in resignation wishing God had made me a left-hander. I always thought I'd be better at creating if I was a left-hander. And I've read how some people when they use their non-dominant hand to draw a whole new world opens up.
Nothing magical happened for me with my left hand. Cat 7 I drew with my left hand (but colored with my right) and Cat 8 is the first one in this challenge that I've used my right hand. My left hand hurts and gets tired sketching a simple cat. So I am back to my right hand and glad of it. An aside for you: I do have a dominant left eye. I found this out when I was in the Army and had such trouble shooting with my right hand. My drill sergeant said to try my left hand. Turns out I'm a south paw! So maybe I have a left-hand outlook on life. I don't know (do you know your dominant eye? It is a good thing to know when you are an artist. A quick way to figure out is look at something with both eyes. Now shut each eye separately The eye that what you saw looked the same as with both eyes is your dominant eye. The non-dominant eye view would have "moved" everything.....interestingly my oldest son is left-hander but has a dominant right eye).
I also have learned (or should say relearned) that the best way for me to draw is to just let my hand go. Quick thinking and just draw. Below are my 7 and 8 day cats.