When estimating penis length from female hands, the biggest issue is camera angle: the whole length of the penis must stay at the exact same distance from the camera, or the results will be dramatically skewed, especially when the reference is at either end of the penis.
Finding usable pictures is not easy, and even though I believe my method is reliable, there is still a lot of room for error in individual estimations, so the results will only get meaningful when I've done a good number of them.
I will do this little by little, so please bear with me.
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Average female hand breadth: 74mm (according to Wikipedia)
My hand breadth: 91mm
I will assume that all female performers have average hand size, and that the same 74/91 ratio can be applied to all hand features.
For each picture I will put my hand in the exact same position as the girl on a similarly shaped graduated object, measure the distance between the two most relevant points, translate that measurement to average female, and deduce the penis length.
I'm completely open to constructive criticism of my methodology
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Pic 01
Cons: can't really tell whether the whole penis is at a consistent distance from camera; penis at a slight upward angle.
My hand: 70mm
Her hand: 56.9mm, 40px
Penis: 148px,
210.6mm (8.29")
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