Hi girly, there is a thin slider at the side of the dialogue box - click & drag it down to see all dialogue choices.
Click on 'Show Item' & your inventory automtically opens.
Click on 'Examine' & then on the art guide.
It should now appear in front of you.
Use either the A, D or one of the side arrow keys on the keyboard to turn the book over so you see the back of it. You'll see a name sticker & a magnifying glass - click on it!
Hope that helps !
