Can I start a sentence like this?
1 It is interesting that the poet uses ( and so on) Yes
2 or should I say "It is interesting the fact that the poet ..... You can, but I prefer number 1- it's shorter and more to the point
And is it possible to say:
3 The poet wants that the readers imagine her beloved No- wants the readers to imagine
7. The cherries represent the woman's mouth which none will have until she decides to give herself.
8. Can I substitute have with enjoy?
I'd use enjoy rather than have- you can have a person (have sex), but mouths don't go with have, so enjoy fits with both the mouth and the cherries.