I can never make the same painting twice, not that I want to, I guess. Still, it would be nice to make a better version of something, or try it in different colors, but I never remember how I did it, or when I fiddled with it, or what went down first. A lot depends on how long you let the paint set before interfering. I drip and fling and pour color onto the glass. Then I push the paint around. You have to have some faith. If it looks like nothing, if you think you've destroyed what might have been a good painting, keep at it. If you've scraped all but a few streaks away, chances are those streaks will suggest something else. Don't give up. Don't be afraid of the mess. The process is a lot like writing. You start with a wisp of memory, or some detail that won't let you be. You write, you cross out. You write again, revise, feel like giving up. What pulls you through? Curiosity.