In a comparative poetry essay you should ideally analyse a mixture of language, structure, poetic devices and feelings/attitudes. You should also make sure you refer to context and focus your analysis on the given theme and poems instead of rambling about irrelevant details. This is the best way to at least address all the Assessment Objectives. To improve your analysis mark make sure you know poems well so that you can make more sophisticated links between them and ensure that your analysis is unique and individual as well as offering a number of different interpretations of a key quotation, device or word.