If you *must* have an introduction, maybe make it one sentence long. i always have an introduction when i write on Hedda Gabler, and always start the same way (or thereabouts): "Ibsen's play, Hedda Gabler, focuses upon the plight of main character Hedda, a housewife who feels trapped in a life she believes she cannot escape from. Part of the reason she feels so trapped is because of .... and we see this in Passage one/two/three where.... etc." Though if I am writing on Harwood's poetry, I might start by saying something like "Harwoods poetry is at times laced with <theme>, and this is evident in her poem <poem name>..." and just keep analysing from there. Then when I'm concluding, it'll be something like 'finally, in passage blah blah we see blah blah and so on and so forth' and then just leave it.