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Well, I got myself in a bit of a state during practise today and everything fell apart! After a cup of tea and an hours gardening I went back and had another go, which was ten times better then the first.
As my bow hold seems OK I think I am going to try and not think about it too much as that is when things go wrong. I will continue with the bow hold exercises and hopefully it will relax with time.
I've been struggling with getting rid of a straight pinky myself. I've been all over the web looking at exercises.
Julia Bushkova in this video talks about the bow hold:
At about 2:50 she introduces the idea of the seesaw. She then shows how to position your hand near the balance point of the bow stick, and push with your pinky to create a seesaw effect. Then move your hand slightly and do the same with your first finger.
I've begun doing the exercise shown in this portion of the video. It's helped me to relax my pinky, since I can see how to push with a curved pickie.
But I would also recommend watching the whole video.
BTW, your second version of your bow hold looks pretty darn good!