There, it's all done.
Resized to 60% of original (view original)
Artist's commentary
GuP Kindergarten Returns! Story 205
A Day Off at the Nishizumis' 4
That's the school head for you--she can keep so much on her plate!
器 literally means "bowl/vessel", but can figuratively mean "capacity/ability", so 器が大きい (literally, "the bowl/vessel is large") means to be tolerant, big-hearted or open-minded.