Best of luck everyone! If I had any confidence in my painting I'd vow something small but without some guidelines on what could be considered 'finished' it's best I cheer from the stands.
May the angel guide your brushes.
Indeed, finished is at whatever level you deem it to be. We're not all super-duper painters but we're still joining in to decrease our backlog and hopefully push the BAs to greatness once more. Every little vow helps and by doing so, you get to take part in a vast painting movement which over the years has shown to be an excellent source of motivation, inspiration, and guidance.
Make a vow, post WIPS, ask advice, and immerse yourself in the event. It will do wonders for your confidence (well, it does for mine)