I think we all (creators) are aware of the quality of our work. Some of it is fine, some go to trash and some are... masterpieces. Pure and simple. Where do they come from? I don't know but I can spot one right away. Either it's mine or somebody else's.
After Alexander Pyshkin, the major 18th century Russian poet finished "Eugene Onegin" he exclaimed:"Ai da Pyshkin! Ai da sykin syn!" Roughly translated as: "Pyshkin, you are a genius!"

I decided to start a new category "It's a Masterpiece!" Because that is exactly how I feel sometimes about the work I just finished working on: a successful work of art, an exceptional painting, a break through (for me!), so to speak, that takes my breath away and poses the question:"Did I just do that?" It's awesome!