On the whole, I think it's a good start but I think you need to improve on the following:
1. Your opening sentence is a bit too vague, try and introduced the theme without being too general, start by saying something interesting, for example.
2. Embed your quotes in a more seamless manner, they should read as if you've written them yourself.
3. Don't be afraid of the semi-colon, in your essay there's opportunities to use it, examiners love this as they see it as more high end punctuation and it boosts the sophistication of your work.
4. You need to cross reference the poems in question to gain the top band of marks, instead of addressing them in separate paragraphs.
Also, with regards to your self marking, don't hesitate in asking your teachers to have a look, after all that is their job, utilising all your resources includes your teachers.
Hope this helps, good luck with your exam