Try using the sliders in CAS. It's what really makes a difference. If you are using the same skin-tone, try adding some variety by making sims with different skin-tones. There are many CC sites that will offer many hairs, clothing, skins, eyes, and make-up. By doing so, it adds variety and sims wont look the same. Hope this helped.
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Who do you consider good looking?
Maybe Google some movies/TVshows you like and check out the Actors.
Go different each time. Long nose, short nose. Dark hair, light hair. Blue eyes, brown eyes. Tilt the eyes, widen the lips...
So, got pictures? I'm trying not to go to sleep. :shock: