I waited for this comment for quite a while, hah. Yes, I agree with you on those assumptions to the most extent! It is really difficult to find out the exact characteristics given only the photos since the outcome can be altered by so many factors.

However, even though I was aware of this - I still tended to look at example photos on tumblr because at least from my experience the sum of all viewed images do give you a good overview imho.

The reason why I handpicked the first six photos by hand is actually because of this. When picking the images I tried to pick the ones that most match with the given characteristic. Off course it is still a very subjective matter.