In An Inspector Calls, what is the effect created by Inspector Goole's manner of showing each character the photo of Eva Smith? - Which key words should be mentioned in an introductory paragraph written in answer to this question?

Writing an introduction to an essay can be one of the most difficult of writing tasks - how to start? For those of us who stare blankly at the equally blank computer screen which awaits our well-considered words, it can be easier to skip the introduction and come back to it when the rest of the essay is finished.