Could somebody please tell me how i can improve this paragraph of my english?

I think you should link some of your sentences; make them into more complex sentences instead of stating what happens and then writing the next sentence starting with "this shows/this is" etc. Also expand; you could easily expand sentences like "..hyperbolic language is used to accentuate his dangerous behaviour>" you should explain HOW it does that, maybe write about the effect on the audience and/or compare to other chapters/sections of the book etc. The sentence with "hissing" could be continued, you don't need to start a new one to explain the effect. "Although mr hyde was not an unstoppable force...." you should continue to explain HOW stevenson reinforces the idea of this. "despite the many ways in which he is described..." you need to mention the wyas in which he is described, using quotes as evidence, again, mentioning the effect on the reader etc. Explain how his physical features never being mentioned generates suspense and tentsion, don't just leave it at that. Hope that helps, good luck.