Costume:
I was inspired to do this costume from this shirt I found here. You can pair a shirt like this with jeans or leggings. Sneakers would be a good shoe to wear with this look. I've also seen this design in a dress if you can find one.
Accessories:
Consider carrying a notebook around with you as an accessory. You can also buy a jumbo pencil to carry, such as this this one:

If you don't mind your shirt getting ruined, you can bring around sharpies and ask people to write on you.
Makeup:
For the makeup, you could use a white eye shadow eye look to match the paper. You could also use matching blue and pink eye shadow that matches the lines of notebook paper:
Nails:
This video explains how to do matching notebook nails:
