Great meta, it's great to see it all pulled together.
One part of me can't believe it's taken so long. The other part knows that I couldn't see it this clearly until S6 was finished...

I emailed you back about the significance of the Big Shark (i read it as Angel/Beast symbolism and a metaphor for the axis mundi being disrupted, with Abigail (angel) in the Underworld and Beast (shark) in the Upperworld)
And I like it very much! That's the lovely thing about metaphors - you can have as many layers as you want. :)

But i totally see what you mean about the shark symbolising River.
Promethia and I speculated on this... way, way back. The fact that the shark and Abigail were two parts of the same whole - 'twas very nice to have that confirmed!

It's wild and untamed, and there's one point where its monstrous mouth bursts through the cupboard (and cupboards are also loaded with symbolism in Moffat's Who) and gets stuck there; so that mouth really shows that fear of being consumed, which speaks of the Doctor's fear of River's role in his life.
Well she kills him with a kiss... She's a shark in disguise.

I love the way you pull out the parallels between Kazran and the Doctor.
They're... kinda ridiculous? I mean, there are SO MANY I'm sure I only touched on half. (I've had this icon for so long!)

Also, Abigail's message and that image of River which i never picked up on at all. Thank you for pointing that out. ♥
And that was something I'd never thought of before, and only noticed thanks to your meta talking about the Library. So thank you. ♥