Found 9 (given that Fubuki's count as one).

Counted 10
fubiki colors
Signs at top
Number of Plates
White part in the pastrys different
Boxes between ri and zuihou
Ri eye color
Ri eating utensil
zuihou face/wink
zuihou fingers held up
zuihou different undershirt color

12 if you also count the grey background being taller than Ri’s head in the top image and what Zekana called signs at the top is actually two items: second sign from the left says “sea cucumber” instead of “egg” and there’s an extra sign on the right.

Don't forget Fubuki's eyebrows