How do I pick out the key features for a question comparing two texts?

You might find it helpful to list some key features you know might apply to the question before you read the texts. The question will tell you what kind of features it is looking for, for example 'presentational features'. Examples of presentational features you might find in any text might include larger, bold text for headings; use of pictures; or how text is arranged on the page (such as columns or boxes). 

Once you've spent a couple of minutes making a list, it will be easier to spot these features in each text so you can compare how each is used differently (or similarly) in your answer.