Excercise: a subjective drawing

I had trouble with this exercise: I thought I understood the written explanation on page 38, but then I wasn't absolutely sure. The illustration in the textbook didn't help. Why was the screwtop of the top of the jar important? Why the inkspots and Old style writing? I suppose that these were subjective elements that meant something special to Emma Dibben (the illustrator of the pickled onion illustration used to confuse me). I guess this is a brand that dates back to the time when people used pens and ink, and signwriters painted shop fronts, or a brand that would like to show that. But still, why the screwtop?
How is this helping me?

I asked other artists I know. I showed them the page. I looked on the internet for some examples and found some too. They meant more than the screwtop of the jar to me. Somewhere in the middle of this confusion, I had contacted my tutor by email and afterwords thought the chocolate idea I was working on wasn't rightly subjective so I thought that I'd leave it at my first effort with the ant. This was a long time ago, and I still ponder about this exercise!

MY SUBJECT:  A big bar of Waitrose Continental Chocolate
http://www.google.co.uk/imgres?q=waitrose+continental+chocolate&um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1280&bih=632&tbm=isch&tbnid=TFbdDyURxdZwnM:&imgrefurl=http://www.ocado.com/webshop/product/Continental-Plain-Chocolate-Waitrose/11345011&docid=uWa-PiQSzw_tRM&w=640&h=640&ei=tPNkTtvVHIOA-waBn4GLCg&zoom=1&iact=rc&dur=629&page=1&tbnh=150&tbnw=150&start=0&ndsp=19&ved=1t:429,r:4,s:0&tx=99&ty=96

I tried to select items that were reflecting the fake antique feel showed by the  packaging to inspire me
I came up with the beginning of an illustration:

.I realised that this was perhaps not what was needed and stopped it.

Ideas of subjective ideas for chocolate straight from the internet:

• I liked the girl and dog one because it shows chocolate is tempting (but isn't chocolate dangerous for dogs?).
• The gun and bullets illustrate the danger aspect - but surely it's not as dangerous as weapons!
• The picture with dotted lines emphasise the symmetry of a chocolate bar, I can see that, but it doesn't excite me. It can also break or mealt... I just collected these images as I wanted examples in my book.
• My favourite is the kit kat one, yes I remember the message too ("have a break, have a kit kat"). In a way it is very litteral. Is this subjective? Does it matter? Has this exercise been completely lost on me?

And here is my best effort towards this exercise.

Yes it could be re-worked and improved in many ways. In fact it can be seen as a first draft. I see it in context, I did this excercise when I was at a low point with my OCA studies and felt very much alone.  This particular exercise baffled me and I wanted to move on. There was something fun about it, maybe I'll go back to it ?
By pure coincidence children went back to school today. Except my son. His teachers are having an 'INSET Day' -  that all kids I know call 'Insect day', well this could be an illustration of  that too.