The rotation thing looks nice.
For the rotation slider, are the rotations synced between the artistic color selector and the advanced color selector.
Is there a use case why someone would want each color picker type to have different gamut masks and rotations. Once I think of a color palette like complimentary, I try to stick to the same palette for the whole painting. Maybe someone else can weigh in
The rotation (and the mask itself) is the same in both selectors.
The colors inside the mask will differ slightly between the selectors, as their color spaces and other traits (especially the continuous vs. discreet nature of the two) can be different. I do not consider it a problem for 1, I'm not aware that anyone uses both selectors at the same time and 2, I think of the gamut mask more as of a guide than a precise device.