barely buff or whole wheat by Sherwin Williams? I just put Barely Buff in my small bathroom and LOVE it but used the next shade up - whole wheat - in a small guest room and it looks phenomenal there... so depends upon the size of your room, but this looks small so perhaps the Barely Buff will be great. If the colors are more grey, you may want to look at Grey Wisp by Benjamin Moore. Check out those two...

Photo? I don't think yours loaded. Try again.

Sorry but I don't understand your pictures. You are talking about 2 bathrooms but we see only one floor plan. Is the 1.52M x 2.24M the 5 x 8 bathroom in your dilemma title. If so, can we see the floor plan of the 5 x 9 bathroom? Is the space with a small rectangle in the middle the extra 5.5 x 4.9 ft space you mentioned in your dilemma? Also 1.52M x 2.24M is in reality 5'0" x 7'4". This is 8 in. less. It can make a big difference on how to place fixtures in a bathroom.

Bathrooms are generally smaller and lighter tiles make the room look bigger. There is also the old stigma that whiter is cleaner. However, it's all personal choice and you can easily choose a darker color.