Brightness in the bathroom is sufficient, are the window dimensions okay?

Hello,
could you please help us? We are not quite sure if the windows for our bathroom are sufficient as currently marked.

At the top of the plan is north, to the right of the plan is east.
Width: 4.40m
Depth: 2.75m

Windows: corner element
Parapet height from finished floor: approx. 1.25m
Length of north window: up to the inner edge of the outer wall approx. 1.30m
Length of east window: up to the inner edge of the outer wall approx. 0.95m
Window height: approx. 0.95m



The shower is planned at the bottom right, which is open to the north. Length of the masonry shower wall approx. 1.60m - room height --> leaving approx. 1.10m passage free
Large double washbasin to the north wall, starting far left with the laundry chute.
Bathtub to the right of the door, in the corner of shower wall/south wall


(here still with incorrect window dimensions)

What do you think? Sufficient? Alternatively, we could make the north window about twice as long. But if it is not necessary, we would prefer it smaller. Also because of the WC below; otherwise, I would have 3m² of window for the guest WC on the ground floor. The window below must look the same for aesthetic reasons as the one in the upstairs bathroom.

hm, they say that about 1/8 to 1/10 of windows is sufficient for a room. You have roughly around 2 sqm. But through the corner, the light probably only enters diagonally. Am I thinking correctly? (I have never thought about these corner windows... until now ;)) Then half of the light incidence is also blocked by the partition wall (bathtub/shower).... :( -> I would be fine with a guest WC window of 3 sqm... you can use the windowsill as a great shelf :D