Now I must admit that there seem to be certain looks that are gravitated to by the community, but so far I have not seen any "twins" like in EQOA or Final Fantasy XI Quick example:
Here's an image of the avatar of Salome Strangelove, fashionista and blogger Linden Lifestyles
Now we're both wearing the adorable Patootie hairstyle from ETD, and glasses, but we look very different. We have different facial structure due to our "shapes" ad "skind". Even something as simple as glasses can have many customization features. I can change those frames, the color/translucency of the lenses and other features at a whim.because those glasses aren't just a single item, they're scripted in Linden Scripting Language. They can do things. And that is just a small part of the customization allowed. It's like Barbie, taken to 11. No wait, Barbie taken to 111.
but it is damned fun, that's what it is.