You switch your eyes from side to side to find a good target until you spot Mary. You only know her full name and that's about everything you can recall of her. She isn't particularly good at anything, but at the same time she isn't the worst. She's always there but at the same time her presense is so quiet that everyone could claim her being there without them noticing. Maybe it's her brunette hair, brown eyes, normal lookin top and skirt and the indoor sandals she wears. Also her body type is, well, pretty normal too. Nothing about her screams, 'look at me'. She is as basic as someone could be sitting here.
You can see her scribbling on the paper something. Maybe drawing some small stick people to pass the time. To you she is the best option since anything kind of change would make her stand out. So you begin to think what kind of change I should make of her.