You can use natural stone like marble for floor but do not use granite for floor at all as it is very slippery when wet. As for tiles do not go for glazed vitrified tiles for the floor for the same reason. ( floor becomes slippery once wet and may cause mishap) Go for ceramic anti skid tiles that are specially meant for bathroom floor. For wall tiles you can use whatever you like and then decide over the matching anti skid floor tile/ marble. Double charged vitrified tiles are usually used for flooring in rest of the house.

You can increase your master bedroom size by dismantling attached bathroom. - shown with red pen. Change the orientation of common bathroom and make it attached bathroom for master bedroom - shown with blue pen. Highlighted yellow area can be dismantled and your living room size can be increased or yellow highlighted area can be used for pooja room/store. Thanks - Anupam (Meraki4Designs - Bangalore)

Hello sir, may I know where is your site located at?

Consider swapping the door to the 4.5' wall for better flow. Arrange fixtures like toilet and vanity along the longer 5.5' wall. Place the tub/shower combo on the 4' side with the window. This opens up space and makes it easier to move around. Happy remodeling!