J'ai trouvé une soluce donnée , mais elle est en Anglais :
Look at the two big bookshelves. Click on evey book and you should eventually find 4 books with a heiroglyphic on one page and 2 flowers on the other. Make a note of which heiroglyphic goes with which flower drawing.
2.
Spoiler:
Look in the draw on to the right of the mirror and see the heiroglyphics in order. They are the same heiroglyphs which you found in the instruction above. Make a note of that order. This is the order which you type in the numbers on the keypad thingy on the desk.
3.
Spoiler:
Back to the flowers. See how many red petals are on the left flower. Multiply this number by 4. See how many red petals are on the right flower. Add the two figures together. So for example if there are 2 red petals on the left flower, 2x4=8. If there is one red petal on the right flower, thats 1. Add the two figured together, 1+8=9. This final figure (9) is the number associated with the heiroglyph.
4.
Spoiler:
Once you have worked out the numbers associated with each heiroglyph, put them in the order which you found in the book in instruction 2. Put this in the keypad in the desk.