Family bathroom in new building

Hello first of all!

Our small family (2 adults + 2 children) is currently building, and we need to know in 4 weeks how we want to design our bathroom. Attached you will find the floor plan and my first ideas, but I’m not satisfied ;) Our builder is somehow also uncreative...

Framework conditions:
- Window on the left side of the plan can be freely positioned, also regarding size (only the roof slope must be observed)
- Door on the right side of the plan is almost freely positionable (slope must be observed, so it can’t be at the very bottom of the plan)
- The 2-meter line is drawn, roof pitch 45 degrees
- The shower at the top of the plan is probably fixed ;) 1x1.5m should be enough for a nice floor-level (initially open) shower.
- The bottom wall of the plan has no special purpose; I just needed something in the bathroom planner to position bathtub and toilet to avoid colliding with the slope.

How could bathtub (rectangular or corner bathtub; a small size is sufficient), toilet and washbasin (double washbasin would be nice) be positioned as nicely as possible? Space for towels and a cabinet would of course also be nice.

Thanks a lot in advance for ideas!!

Best regards
Holger