First, to create an interesting paper, it is necessary to be extra careful and attentive when choosing a topic. As it was mentioned before, it is better to give preference to the topics you really like, or just apply to our services for help in case you cannot think of a decent one. Second, a good introduction for a critical analytical essay writing predetermines the whole line of research and, possibly, a conclusion as well. A bit of brainstorming is a normal thing when it comes to coming up with a good idea for the opening part.