hello! after cinerender it is difficult to work with layers in the corona. For alpha mix - one shader, for operator - another, for opacity mix - third.
That if i want to mix 3 picture? one is basic texture, the dust in lighter mixer for 20% and another dirt in multiply mixer for a little. In corona i should to use huge complex construction.
In cinerender it realized like in photoshop: a lot of layers in one list with different opacity and mix mode. And we can replace it, and move in folders, and add alpha-mask
Look at this, maybe you will think about it?
https://helpcenter.graphisoft.com/user-guide/65886/same in photoshop: