I find this passage very interessting as Orsino notices Cesario's feminine aspect yet do not describes them in a bad light. Actually, he describes Cesario's lips and voice rather positively (comparing him to a Goddess) which is in a way, direct characterization for Viola but also some kind of inside joke between Shakespear and the audiance who knows that Cesario is a woman. Orsino's description seems to be a forshadowing that he will fall for Viola as he already finds her (or at least her lips) beautiful when she pretends to be a man.

Viola has fallen in love with the Duke and admit her feelings to the audience thanks to the use of a soliloquy

Duke Orsino would rather be aggressive than take no for an answer. This shows that he is not afraid to use his power (as a duke and as a man) to get what he wants