Yes, it is difficult to take beautiful pictures when doing this asanas. What I see when I study these pictures. It should be possible to bring the chin on the floor. Sharath says on his CD: "Put the chin or the head on the floor. " So both seems to be accepted. But as every asanas can be improved, I try to put the chin on the floor next time.
I can bring my feet back without touching the floor. How I shall do this when I want to put the chin on the floor is still a secret to me. I will ask!
I took pictures during my yoga session, flow gets lost, but I have a second practice this evening, a led class and then I will experience flow.