I was just wondering,
Is there any set way to properly annotate? also What do assessors look for with annotations?
Answers would be greatly appreciated 
an example more so. =D
A bit late, sorry, but im sure will be helpful for future people. Well my teacher wrote on criteria to MAYBE CONSIDER "production systems, what you like and dislike, methods, media" etc.
What i take this as, and what i do, is only annotate every few pieces to avoid over-crowding, its useful if you have blank space and you don't know what to fill it up with. Also, don't just say "i like this", well its obvious you like it, if you included it in your folio...explain >>WHY<<!! And don't write sentences of more than 2-3 max in otehr words, keep it brief, its annotation, not explanation. Do lots of arrows, and dot points. Hope it helps.