As a photographer of 7 years, and a paysite owner of 10 years, I'd say you would be crazy to shoot 2 girls without
'lots' of looking at the camera.
Imagine yourself the viewer, looking at the pics.
They want to think 'hey i'm part of this, the girls want me'
not 'the girls are into themselves and cant give a flying fuck about me'
It drives me crazy when our photographers shoot girl-girl without lots of eyes focused on the camera shots, the sets are useless!
Look at these pics, do they arouse, or turn off ??
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I shot all those sets myself, and made sure the girls had as much eye contact with the lens as possible.