I also got full marks in my art GCSE but I would like to point out that I didn't fulfil all of the criteria suggested on this thread, for example, I did not include title pages.
My art teacher explained to me (and it was clearly effective) that the main things that you must include are:
-observational drawings (drawings copying close up photos in relative detail, trying to make them realistic)
-artist references (do not include any info on the actual artist just on how they have created their artwork, the effect it has, your opinions of it and how it will influence your work. For some of your artists, you must create a piece in their style showing how you have responded to their work)
-photography (it is important to include multiple photoshoots throughout your project as well as smaller groups of photos where appropriate)
-pieces using paint (it is important to show that you are confident with the use of colour)
-annotations (keep all of your annotations neat and write them as if writing a diary - what you like/dislike, what is effective, what has an impact)
-development (each page should link to another page but note that it does not have to directly link to the pages immediately before and after, in fact you can get extra points for "imaginative leaps in ideas")
Remember DO NOT:
-include overly large titles or writing of any kind, if it is too big, bright or obvious, points will be deducted because it distracts from the work
-forget to include any of the criteria listed above
-leave large empty spaces or purposely try to fill spaces with anything useless, even if it means your project will be shorter
-include information about an artist, like where they were born, grew up, worked or age
-have a really short project (for example 10 A3 pages or less) because this is not enough to demonstrate a consistent ability
I hope this was helpful