Anyway, finally figured out where I was going wrong, but been having a hell of a time getting my arm through, there's just no space. Maybe it's a guy thing, hairy arms and legs, plus it being winter and not getting that sweaty.
At last it's started warming up and I was sweaty enough today to get my arms through, and they're level! I've got that glum face in hands thing down and everything. But now the problem is controlling the rocking, so much harder like this. Four times trying to video this I ended up falling to the side and getting stuck, really stuck, bound so much tighter now it's hard to get out of it. Stopped finding it hilarious after the second time and not even faintly amused by the fourth.
Finally got the hang of it and so am not as glum as I look. This has to be the second most ridiculous asana after titibhasana.
Oh and there's a Jump back and through, shot from the frount to justify the post.