After visiting the site yesterday, I noticed there are a few aspects missing from the diagrams being made: 

Aspect 1: Some of the flattened areas of the formation have a specific clump of stalks intentionally left standing up. They are distinguished by being at the very centre of swirl of flattened stalks, such as here: 

 

And this is where they were located from a wider view: 

 

Clearly they are part of the design. They have been specifically put there and so must mean something. 

The other thing I noticed is that they weren't on every repeating image going around the edge. I think (not 100% sure) they were in about every other one (man/woman ?). Every repeating image had the same swirls of crop, but not all had clumps left standing at the centre. 

2. The other thing I noticed, was this solitary spiral in third image around (going clockwise from the big spot), not being included on diagrams (and interpretations) of the site so far. 

 

Here it is close up, it's forms a donut shape: 

I was initially interested in this as it was at the centre of, and completely surrounded by, an undisturbed area of crop. The crop is so close together you couldn't get to where it is without damaging the surrounding crop, so how was it done? 

When I looked for it through all the other photographs, I couldn't find it at all in some of them. Such as this one: 

There is nothing in the centre patch of crop. But in other photos you can clearly see it is there. You can check it's the same part of the formation by the tramlines. They uniquely cross each part of the images. 

Looking back for it in early aerial photos I couldn't find it at all in some of them. Unless they have been manipulated in some way (e.g. by software), it doesn't seem to have been there at all originally!

Mark Worrall