As a guy with a 16 cm dick, Nikke's looks spot on in terms of length. The commenter about the shape of the dick heads was also pretty spot on; there could be a bit more variance in the shape. From my personal and admittedly fairly limited experience, few people in Finland tend to have such a rounded glans, a somewhat more concave shape at the top seems to be more common. (Or then I'm just accidentally extrapolating from my own). Also, if you want to bring in even more variance, one of them could have the foreskin cover the glans entirely even when erect.
Okay I said the last one just because I think that's fucking hot, and it's pretty much the only thing about my own dick I would change.
