White is not " white" , it is usualy greyed for coverage. If you pick
white for ceilings and a beige tone for the walls it will not look
right, you need a beige tone white. Regular white "greyed white " goes
with blues and greys.
Mixing in wall color balances it out, usualy a quart or so. But it
depends on your color scheme, and starting with " ceiling white" which
is greyed is a mistake. Use a premix " beige " white.
I just had 2 ceilings Faux finished dark and it looks great , the
ceilings are now worth looking at. Your painter is color blind
unfortunatly, and not much of a decorator in a decorating business. Use
your instinct, not your painters.
Benjamin Moore has the best colors and people there can usualy direct
you. Sherwin Williams is a second or third. You say you are using Earth
+ beige tones, so definatly do not go standard " Greyed" ceiling white.
Same for Trim color White is greyed, based to blues and grey. Pick your
colors well, once they are up , they are up.