That the four hands add to the beauty of this beauty Queen is to say it naively. But remember She is the Queen of the Universe. The majesty of that status is shown by the bow and arrow in the two forehands. But
She is also the Benefactor of the bliss of Mokshha; therefore She is the Queen of the Empire of Enlightenment (jnAna-sAmrAjyaM). RAga (Attachment) and dveshha (hatred, enmity) are two arch-villains that constitute the obstacle to mokshha.
These two are killed by the noose and the goad in Her other two hands, thus establishing that She is the Queen of ‘jnAna-sAmrAjyaM’.