I scored quite low in the storyboard, and reasonably so, since I have never boarded anything before. In fact, I'm really weak at storytelling in general. I'll need to work on that for sure. But generally, you want to make sure you have a good story that's plausible for an animation or film (which I do not have).
For the record I did not see a "perfect" storyboard from our year. But hey, that's what anime(tion) school is for!
Elizabeth's storyboard scored one of the highest, 22/25. The link is here.
The typical portfolio has a surprise ending on the fourth panel, and you might want to include that. But more experienced story-boarders have much more plausible storyboards which do not necessarily feature a surprise ending.
This is the heaviest-scored section so make sure you really do it well. Ask for advice from everyone, even your family and friends. See if they can understand the story line without the accompanying text. Instructors will be marking them by looking at the images first and then reading descriptions. You need to logically use different types of shots--I heard the standard is one closeup, one full body in three-point perspective, and one mid-shot. Make sure your character is on-model; pay attention to small details! And because I was extra, I scanned them and digitally cleaned them up. Digital cleanup on any one of the animation sections is not considered cheating. It's common procedure in the industry. But do not clean up your observational drawings! That would be dishonest.
You're being marked on: Clarity of story, correct character(s), consistent character, performance, composition, structure, perspective