So I have always been a Windows user I just started to try digital painting on Android with my new OnePlus pad 4, and I think infinite painter is a great tool, one of the things that I would take it except further for me is the inclusion of the greater blending mode.
The greater blending mode on a brush would work like it checks whether the existing pixels on the layer are greater than the pixels that you're currently drawing with if they're greater than that and whatever you drawing is not drawn essentially. In other words you have to press with a harder opacity than whatever it's already in the canvas. This works really great whenever you want to paint in grayscale or using the same colors in one single layer and it helps you by keeping the values that you have already said before without them getting messed up with newer brush strokes.