The characteristics of a successful project are;
A well defined topic, that is clearly presented and easily understood by people of all skill levels.
Clean notes for yourself that can easily be referred to and understood.
Formal language that is both understandable and not slang.
Use of proper terminology where it is needed.
and, especially, for the project to be well presented. A project can be absolutely pristine, but if the presenter of it does a poor job presenting, it can easily fall short.
I hope this helped.