I just stumbled across this delightfully ordinary portrait of gawky teenaged Lulu and young teenish Yuna having a quiet afternoon in Besaid.

Safe for work and preschoolers. :D

Also poking at a Lulu icon. I'm still not quite satisfied with it, but I've been trying to make/acquire a smiling-Lulu icon for years, and finally ran across a high-quality screencap of her one and only grin (which was, by happy coincidence, to Auron).