Is the reason for the comparison or contrast clear?
Your essay should not only be smooth to read, it should provide a clear current of reasoning.
Repair obvious places where you have left out details, failed to clarify what a paragraph will cover or otherwise need to clarify.
A second draft is one of the most powerful ways you have to improve your work.
Have someone else whose reading and intelligence you trust read the essay and discuss it with you.
Never forget that what makes sense to you can fall apart when presented to a new mind.
That is a lot to cover, so realize that using the structure also means keeping each section lean and tight. Writing a Theory of Knowledge (TOK) essay is one of those.
Again, 1,600 words is a very small space in which to cover some very big topics. To produce a good TOK essay you need to have paid attention during your TOK course work, taken an active part in TOK discussions and learned the basics of writing.
Choose a topic with clear boundaries, a focus on knowledge in the title, and a question that can be kept in sight at all times.
A TOK essay offers you only 1,600 words to work with to do a reasonable job of examining the various approaches to the topic under discussion.