EXAMPLE 3
This layout cannot work because the shower is, once again, blocking the only window into the bathroom. The bath is also in an awkward position, blocking off the main access/doorway to the bathroom from the hallway.
The sink is in an alright position, with plenty of room around it. It would be awkward to use because the bath is blocking the main doorway, but is in a good position to access from my sister's bedroom. There is a lot of room for movement and changing in the center of the bathroom.
The towel rail is quite far away from the shower, sink and bath which would be unhelpful in terms of better design.