My Last Duchess - Robert Browing

Hi, I am doing a 15 minute viva, in which I need to use the poem, My Last Duchess. However, I need a topic / statment in which I can use the poem as evidence. Any ideas?? I am really stuck for ideas, am in grade 12 so it has to be "complex". Also, I need help in identifying the poetic techniques used. I know what the poem is talking about, and what the Duke has done, but I need specific examples of techniques used. It is due a week from today, and I need help BADLY!! I also need to use other eamples of poems as evidence to (for the topic), so if you have any ideas about poems that relate to My Last Duchess, and / or a topic ... please say so.