Painting Update - Trouble deciphering the hands

Been jumping around a bit tonight. I think I got the suit at a good point, and figuring out the texture of the dress is going well. Here's a detail shot of how that's coming along.

The hands though are killing me. Not because they're hands - drawing my own hands got me through many study halls and lunches - it's another case of the ref photo just being too low res.

Deciphering this is hard. At first, I started drawing that whole mass as David's hand, but the more I looked at the top hump, trying to figure out what's going on, the more it looked like those were actually Alison's finger coming out, like they would if they were holding hands - eh? The slight shadow supports that idea... but then when you put that into practice with your own arms, I can't bend that way - and I'm pretty bendy. So, back to that being part of David.

Then, just trying to figure out how the hand holding is working out has got me stumped. If you look at where David's pinkie ends, perpendicular to it, there are 2 highlight lines with a shadow line between. To me, this reads as the tendons in a wrist, which would mean Alison's palm is facing to the camera... but the shadows on the elbow are reading to me the opposite. I might have to see a recreation to understand this part.

Here's a detail of where I'm leaving the hands for now...