I will be participating in the 30/30 challenge in Sept. I previously challenged myself to do 100 in a year. I ended up with 57 and boy the progress I made was invaluable.
I learned how to prep for intentional painting, instead of finding myself with an urge to paint, but can't because I don't have what I need. I learned that to me, painting is something that I want to do full-time one day, so I prioritized it along with all the other things in my life I see as "important". I learned to paint more loosely. I wasn't so anxious about getting started either. You have to through that anxiety right out the door!
I also learned to not be so married to one painting because there would be another one right behind it to begin. When I'm not doing just 1 or 2 paintings every few months, they don't all have to be masterpieces so I'm not so hard on myself when things do go spectacularly. That being said, you also hit THE ZONE more often when you paint more often. You know what I'm talking about....when it just seems to flow as if it's meant to be!
Good luck to all who participate in the challenge!