1st. You are right I am still trying to get my handle on this and our team has thrown out a few definitions and attempts of clarifying things from my end. 

The index does more than just count pictures and images although that is part of it.  It also addresses the screen and glean score that I borrowed some ideas from Jakob Nielsen on this.  It looks at bold text, italic text, paragraphs considering the Weibull distribution to figure it out as explained above.
Basically, if you cannot get my attention in the first section, you may possibly not go on and read a bit….  (see my yellow highlighted summary agove)
Therefore, most people leave within the first 5 seconds.  

Beyond storytelling
We have another index that addresses the language – difficulty, etc. being used to get your story across here:
====>  ComMetrics Mnemonic Score 

Thanks Karen for answering.  Urs @ComMetrics:twitter 

Now the real tough piece to measure would be on the quality of the ‘story’ that’s on the website. As you know, not all photos, photo essays, or videos turn into conversions because they end up being poorly told stories. Same with the text.  But what I like about what you are doing is that by giving a score based on your algorithms, you are indicating that with a low score, your stories obviously are not working like they should. So back to the drawing board!

I think you are really onto something here.  I would love for you to share more examples as you collect them. Many thanks for this piece of work. I’m excited about it.

Thanks so much for stopping by and taking the time to have a look at this material.  Of course, I appreciate your feedback very much and I hope that we continue to provide you with useful material.

What I am really curious about is also to receive suggestions on how we can improve this with a comment or using e-mail such as info at CyTRAP.eu  where I will surely get it

I appreciate your feedback and wish you a Happy New Year!  Ciao @WebUrs:disqus 

There are still some fine-tuning efforts we have to undertake but it seems to be working…. more engagement, more conversation, increased pageviews… , more successful reaching out to targeted audience.

Not bad for a start?  But based on some comments I hope to get we can still improve this.

Thanks for sharing and Happy New Year to you and your loved ones from us at @ComMetrics:twitter 

Very exciting work you are doing here.

I have some data where we tried to test it with our blogs and some of our clients and story has an impact on what kind of engagement you get.  Of course… so if I can then find an algorithm that helps simplyfying this difficult task of analyzing these difficult data, voila.  Not bad.

I am still revising this post but it is coming along nicely.