It probably won't matter much how others hold their Oasis. Each of our hands are just way to different. I am someone that has wrist issues and for me the Voyage was hard to hold and still pressing down on the haptics. I think because the bezel was so small so it keeps slipping out of my hands.
So when I got the Oasis1, I was very happy. I was holding it on the thick end and its very comfortable. Mind you, I could never do what you do, make some sort of "L" as that would really stretch out my little finger and having to stretch then with the thumb to put my hand near the buttons. My hands are small and my fingers short I guess.
The Oasis2, it took me a wee bit longer to find the right position. Again, making an L would not be an option for me, so I kind of hold it in a relaxed way so my thumb is in between the buttons, with resting more on the bottom one. I can still stretch a bit to go back. I have bottom as forward. My fingertips are kind of laying in the groove. So for my hands its about perfect. I can keep my hand and wrist relaxed and so not cramp. My index finger is too short to hit the groove, just the middle and the next one. The little one just barely feels the edge of the groove. that makes my thumb be a straight line to the arm and my wrist is also, so not bend.
It is really really hard to describe. It took me a few days. I would never though lay flat in bed to read and hold any device above me. First off, i'd fall asleep in an instant if I'd lay flat, but my arm would get tired just hanging there in mid air above my head. I always prop myself so I can then rest any kindle on my blanket, which I make a roll with to get just the right height. I do very little reading in bed though.
Since I sit mostly when I read, the weight of the O2 falls into my palm as I tilt it forward, so I don't have to actually cramp up by holding it. I let gravity do its thing. Like a 45 degree angle? Again, hard to explain.
You have to be comfortable and if it doesn't work for you, it doesn't work. Its hard to get into a book if you keep feeling your hands, wrists or constantly have to adjust something.
I am not sure if I am capable of taking a photo while holding the device. I am a horrible picture taker as it is, it always takes both hands for me.
Maybe tomorrow in day light I can try to give it a shot. But again, that won't help you if you have specific reading positions you need the reader to work for you. That is so very individual