Don't swamp the screen with what you think is your most important work. The lag time might kill you, and you'll risk second guessing that the image you throw is the one they want. Each piece should be accompanied by a 15 to 25 word statement about the piece. This exercise not only adds interest to the piece, but gives the reader a glimpse into who you are and what value you can bring to the prospective's table. This folio doesn't have to be extravagant.
Clarity is the main objective.
The viewer should never have to work for the outcome. They should flow smoothly and easily into the track they select. They should be able to view most or all of the folio in five minutes or so. If they linger, you've got it made. But if they exit prematurely you're lost.