At less than a foot in height, Chell would be easy to lose in a crowd.  It could be a crowd of garden gnomes, even: she's small enough.  The real gnomes might object, but that's a risk you accept in high-stakes lawnscaping.  As slender as she is, she can't weigh any more than a couple of pounds, and her piccolo soprano barely carries over a single animated conversation.  The bright colors make up for it a little, though.

Behind her, shimmering wings stretch out to nearly the size of the rest of her, a pair to each side.  Structurally looking like dragonfly wings, they catch and twist light in a way insects' generally do not—refracting it like clusters of little lenses rather than the normal oil-slick iridescence.  They darken past the midpoint to an especially lurid pink, the same color as the tiny beads of moisture that occasionally roll down one edge or another.

The rest of Chell is pretty pink too, even leaving out the clubbing getup in rose and bronze.  Her hair, short and chaotic and never swept the same way twice, is a more visceral shade, with white highlights streaking through rich salmon.  And the eyes!  Hers are glossy enough to obscure any detail, and what looks like a more intense shade at first turns out to be translucence swallowing the light.