I'm glad I gave myself more time, it allowed me to push beyond my currently capabilities to actively attempt achieve a higher quality image...from now on, I'll try to cultivate greater patience for my art to strive not for a "finish", but an inspirational image in league with artists I admire.
I made an additional discovery, apparently, Ipads, for whatever reason, have two automatic brightness toggles: one in the standard display menu, the second, buried in the accessibility menu: the screen's brightness will only remain consistent it both are disabled...such a convenient feature...
For over a year I've wondered why my art constantly appears darker when exported, only to realize my screen adjusts to max brightness beneath my work lamp, so I instinctively picked darker colors to compensate...its's unfortunate how many, otherwise good piece, including this portrait, may've been tainted by technical complications...better to know now then never, I suppose...at least my values will be more accurate henceforth.