My Last Duchess

Repetition of the painters name suggests self pride

Form of bragging about his wealth

Link between London through control and abuse/excessive flaunting of wealth and power

Parenthesis represents control 

Nobody has the power to show the painting other than him, obvious due to his sheltering of the painting; adds the statement to emphasise control.

Shows the duchess is now under complete control of the duke and can only be seen by others when he condones it.

"She had/ A heart-- how shall i say? - too soon made glad/Too easily impressed"

Lack of power made him kill his wife-

Felt that his wife was too appreciative of the attention she received 

Wanted his wife to smile at nobody but himself.

Used his power and command to have her killed; linking with power of humans and how the Duke had used his control to kill his wife.

Shows how he was willing to sacrifice "happiness" and "smiles" in order to prevent his wife from being appreciative.

Overarching irony in Brownings "My Last Duchess" as it is not about the duchess but about the controlling, jealous and arrogant nature of the Duke linking powerfully with the theme of power of humans; showing the events taken place due to a increase in abuse of power and the controllive nature of the wealthy, leading with a conclusion in turn to resolving the "problem"