Sometimes you're working away in a painting and then realize you've over done it to the point that you've ruined it. Good thing we can always crop it!
You can crop it on your mobile (scan and crop) or do it manually. Take a piece of cardboard or paper and make yourself a view finder (a little square or rectangle where you can look through) then use it to go through your painting and see if you can find a smaller composition within the ruined painting.
Here's an example of watercolor before cropping it:
Here's once cropped:
