It's been a great pleasure to work on your exciting competition ;)
Please feel free to ask any questions if you are unsure about anything in my proposal. As it's my very first competition, I'm not so experienced in what exactly is needed.
The main changes I've made in the suggested layout was to place the toilet on the ground floor under the stairs. Well, I've also replaced the stairs to create one large staircase all the way throughout the building to enable enhanced natural ventilation. Also, I've swapped the prayer room with the open storage area, but I kept the wall height low - aligned with the window top level. This way the prayer room gets more natural light, while the storage is more hidden, but still open.
If you are willing to extend the living area on the roof terrace level, I'd suggest using solar mat or solar shingles laid on the roof instead of a fixed floor based device.
I've placed a room for the hot water storage tank in the roof enclosure. The AC unit and other HVAC devices I'd place in the back side, as you can't build in that zone anyway.
For the main facade I've drafted an aluminium curtain wall system with a combination of transparent and semi-transparent panels and horizontal wooden battens. In addition, dark concrete elements were used around the openings for shading and decorative purpose as a contrast with the white walls.
Anyway, good luck with your building project!