Direct the audience and not the board too much. A bit of a sales pitch helps. Appropriate pauses for questions. Conciseness vs. thoroughness. Erase displays from previous presenter unless they're still relevant.
Clear handwriting helps.
Use space from left to right. Admitting when you don't know or are unsure. Taking criticism or suggestions. Avoiding vs. taking advantage of digressions. Relax and get your audience to relax.