Morris,
I consider most paints to be transparent or semitransparent. The only truly opaque (occlusial) colors are titanium white, yellow ochre, gold ochre, and Indian red. You have picked one of the few truly opaque colors (yellow ochre) as the base for your "transparent" glazing. I would guess that therein lays your problem.
(My favorite transparent flesh tone is a mix of quinacridone rose and Rembrandt stil de grain yellow -- a transparent golden yellow).
Peggy
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