"Ferrara" - reference to Al fonso II, fifth Duke of Ferraro who's wife died under suspicious circumstances
"That's my last Duchess painted on the wall" - possessive pronoun + enigma makes us question if there have been previous wives / is this his last?
"Will't please sit and look at her?" - rhetorical question suggests she is an object who's sole purpose is to be looked at
"Frá Pandolf" - repetition of the artist but never a mention of the name of his wife emphasising the Duke's egocentric, pompous demeanour
"(since none puts by The curtain I have drawn for you, but I)" - parenthesis reflects the Duke's complete control over the portrait and could mimic his possessiveness of the Duchess when she was alive
"twas not Her husband's presence only, called that spot Of joy into the Duchess' cheek" - reflects the anger the Duke feels for other men being able to please his wife
"too soon made glad, Too easily impressed" - repetition emphasises how the Duchess was impressionable and promiscuous which reflects Victorian patriarchal misogyny
"white mule She rode with round the terrace" - Duke is alleging the Duchess was promiscuous through sexual innuendos
"She thanked men, - good! but thanked Somehow - I know not how" - insinuating promiscuity
"as if she ranked Mygift of a nine-hundred-years-old name With anybody's gift" - his status was a gift and she wasn't grateful for it
"I gave commands; Then all smiles stopped together." - noun connotes power and authority + monosyllabilsm is blunt and direct + metaphor for death
"Notice Neptune, though, Taming a sea-horse, thought a rarity" - allusion to Greek God of the sea + metaphor for patriarchy, man 'taming' women and Duke is hubristic / God-like / omnipotent