Technical writing has to involve a logical structure from problem to solution to evaluation. But before you are at the stage of writing down all the details, it is often a useful exercise to write down just that logical structure. Then, your mentor can see whether the ideas hold together.
As I have written elsewhere, the key concepts to describe are:
- the problem;
- that the related work does not address the problem or not well enough;
- the proposed solution;
- an evaluation that your solution improves on the problem beyond the related work.
- the results.
Writing in point form, it is easy to start delving into details. If the point is to simply make sure that the argument is logical, this is a mistake. Otherwise, replacing sections of the point form with details can be a useful, iterative approach to writing.