I agree with divadeva. More lights. If you can add pot lights do it. If they're already there add task lighting and up the wattage on the bulbs on the pot lights (replace with LED and you can make them brighter because the wattage on LED is lower for brighter light). If you have all of that add decorative lighting. If ventilation is an issue find a way to move the air around or add air filtration. Maybe the HVAC is deficient. Maybe you can add a HEPA filter instead of the standard one that comes with the unit. Call an HVAC specialist to see if there is a way to boost air flow in the room.

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.

Waterproofing of all wet areas in a building is essential, not a luxury to avoid. Several concrete buildings built without doing so in the past are having to undergo maintenance work now. Also ensure all plumbing works including any concealed wall pipes are capable of handling appropriate water pressure and checked for leaks before concealing. There are several methods to waterproof wet areas such as waterproofing membranes and/or under tile applications. Do remember all standard ceramic tiles as well as concrete is porous, not 100% waterproof.

Hello Ash, Jaipur Blue Pottery tiles are definitely suited for kitchen backsplashes and are heat resistant since they are fired in a kiln like other ceramics. I bought mine from a vendor in Jaipur, and got them shipped to Bangalore. Just make sure to be very very clear on what you want - hand-painted or screen-printed tiles; there is a big difference between the two. Happy to discuss further. Thanks, Gargi