I was also thinking serial killer, but an Ed Kemper self-portrait related to his murder of his mother. That sig could be read as "eD K" I guess. Anyway if you find out jtw, notify some authorities!
P.S. it's also weird/odd that the naked nymphs seem to be MUCH better painted and styled, compared to the rest of the painting. If those aren't literal photos, this seems a virtual artistic photoshop of some other painting which was painted by a better artist. So this one copied those nymphs. But even if the case, those copies still seem incongruent with the painter's general skill (doesn't seem at all capable of copying them so well). Seems either two people painted this (a possible serial killer in tandem with a professional forger and/or good artist), or those are photos applied to it that you can't quite see, or the painter suffers from a really bizarre disorder. Where he copies masterful depictions of nymphs, yet the rest of the painting sucks.
Or possibly he meant to show dichotomy and this was intentional, by intentionally painting bad for the rest. But really, this is just weird.