Question

what is the line mean the hand that mocked them and the heart that fed

Answer 1

The “hand that mocked them” (meaning the passions depicted on the shattered visage) is the sculptor's hand – the sculptor was “mocking” the passions (with a play on the two meanings of the word “mocked” – “copied” themand “ridiculed” them); the “heart that fed them” is the heart of the ruthless tyrant himself, ...

Answer 2

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The “hand that mocked them” (meaning the passions depicted on the shattered visage) 
the “heart that fed them” is the heart of the ruthless tyrant himself, ...