Q1: My house's stair is quite the same as this but the problem is, it is quite slippery. I found some solution for it:

            - one of them is to put the tape which prevent slippery [but it will make the stair ugly.]
       
           - use some anti slippery chemical which I dont think can be found in normal hardware shop and I dont know how long can it last
  
           - to cut some lines on the tiles and put metal in the lines which is something like wat they did in shopping center.
Q2: Is there any lighting that is suitable for the living room or room if plaster ceiling is not use besides long fluorescent tube