Writing criteria

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Can someone please explain to me how to score highly on the 'Relevance, breadth and depth of content' section of the writing criteria?

I was looking through the criteria and there was hardly any difference between 13-16 and 17-20. Can someone explain the difference between: Effective original personal or imaginative text focusing on an event or experience in the past, present or future (13-16 marks) and Highly effective, original, personal or imaginative text focusing on an event or experience in the past, present or future (17-20)? For 17-20 they also said to 'show some sophistication in the writing'; does that just mean to use idioms, etc. ?

The critria is quite ambiguous! Any help would be greatly appreciated.

I thought you guys would like to see the criteria I'm talking about:

17–20 marks   Highly effective, original, personal or imaginative text focusing on an event or experience in the past, present or future. Comprehensive understanding of the narrative perspective and kind of writing required for the task, including, for example, appropriate use of an introduction, body and conclusion. Relevant and comprehensive content showing some sophistication in the writing. A broad range of language (including accurate vocabulary, grammar, punctuation and where relevant, script) is used appropriately for the audience, context, purpose and text type. Ideas are organised and effectively sequenced throughout, for example, within and between paragraphs and with cohesiveness in the writing as a whole. Simple stylistic techniques are successfully used for effect.

13–16 marks   Effective original personal or imaginative text focusing on an event or experience in the past, present or future. Clear understanding of the narrative perspective and kind of writing required for the task, including, for example, appropriate use of an introduction, body and conclusion. The content is relevant and covers a wide range of aspects within the topic. A range of language (including vocabulary, grammar, punctuation and where relevant, script) is used appropriately for the audience, context, purpose and text type. Ideas are well organised within and between paragraphs and follow a logical sequence throughout. Stylistic techniques are used.