I look at a speaker's ability to control the room and get their point across accurately and quickly. When you cite evidence confidently, that shows me that you've done your homework. Eye contact to other senators and judges is very important - don't just read off of your sheet! It's a pet peeve. Comedy and puns don't do much for me (but I won't mark you down for them), but accuracy and confidence are very important. I judge more heavily on style than content so long as the content holds value. In short, I want all eyes on you when you speak and I want you to project your speech confidently and clearly. As far as questions go, be sure to challenge the speaker rather than just ask a question they'll obviously agree with. Make sure you're present in the round quite a bit with attempts and questions as well.