I used cubist colours partly because Mary Twice is loosely speaking, cubist. The analytical cubists claimed to be painting subjects from all angles but, obviously not. Long ago I dropped the possibility of an analytical approach to my multi perspective paintings because it is too stiff and also under a more strict anyalysis than art history, impossible, and... very stoned.
I am planning to add abstract expressionist, transparent colours over the desaturated portrait. I presume the subdued colour of the under painting will not clash with the glazed finishes and allow things to happen more... organically.
I have no excuse for doing this other than - I can and, I want to.