Sentence:  ... you had need cause the party whome you will drawe to sit ... without stirring or altering the mouth were it neuer so little: wherefore you shall I beleeue find (a mans face) aboue all other creaturs the most troublesome vnto you: for either they will smile, be <WSD>ouerlooking</WSD> your hand, or setting their countenances to seeme gratious and comely, giue you choyse of twentie seuerall faces. 
Meaning of the word marked with <WSD> tags:  To observe or watch (someone or something) surreptitiously or secretly.