The first pictures shows exactly the leg position, only that I'm in headstand and not on my hands. Nevertheless this picture helped me a lot. It showed me that I don't have to be so afraid of falling. I studied the position when I was into it. The abdomen are engaged. The knees are very close to the body, so are the feet.
Today I tried exactly this. I tried to bring my upper legs to the body as close as possible. I couldn't hold this pose. There is still some work to do. Yet the vinyasa (forward jumping) was very good today. Often the feet didn't touch the floor when I moved the legs through the arms. This is the way.
My next exercise is to try this pose when on my hands. The wall might help here at first. I only want to feel the pose so that I can remember it when I jump into it.
Oh, today is a moon day. I didn't know it because I haven't checked the moon calender. I was so glad that a yogini was at the shala. We practiced together. It was such an intensive practice. I simply loved it.