Probably clarity and the who, what, where, when, why and how principle.

If you can make sure that people can see the info they want in a few seconds then it'll make it easier to understand what the RP is about. So when you write up your interest check, take a step back and think of how a first impression viewer can read it.

Like what the others above have said, stylise it a bit. Humans aren't programed to read solid amounts of text so break it up with headers, maybe some colour, and dot points.