So you learned that taking photos of your painting as you work on it will help you see potential problems in its composition. Now, let’s take that useful trick a step further…
When you are about 70% finished with the painting and you are hesitating, afraid of overworking it, get another photo of it and upload it to your computer screen. If you have a Mac, you’ll be able to click on “Edit”. When you do, you’ll have the option to increase or decrease the “Contrast” on that particular photo. If you increase the Contrast, chances are you might see that painting come alive. It will show you where you need to increase your values and darken your shadows. As you compare that photo to your painting, it will become clear what your next step should be.
I know that there are other Photo programs out there, but I’m not familiar with them. Sorry! But I’m sure each one of them has similar options.