The bar cabinet is taking sharp . i have finalized with a painting for the door of d cabinet which will be on either side . the centre plank is empty . please advice on how will it look and what should i do in the centre plank

The DIY concrete floor finishing products are rarely up to "snuff" for a living situation. Most are meant to be put down in a garage where it doesn't matter if it bubbles and lifts in a year or two. Many have failed because of wrong application technique, wrong use, wrong product for the concrete, etc. A finished concrete floor in a new build is a great option. The concrete professionals will get the surface ready for polishing. The concrete floor finisher (may be a different person than the guy who installed the slab) will come in and clean/shot blast the concrete and add a layer of appropriate, high-end, high-density concrete. This concrete is then stained (if you want it) or if you want simply polished and coated with appropriate epoxy. It may take more than 1 application of the stain/epoxy to get the look you are after. This is not a "money" saving product...it is a lifestyle finish that is equal to (in price) other medium/high end finishes. It is very important to understand the quality of concrete seen with a normal slab/subfloor is NOT good enough to be polished and stained. That's why a new coating of high-end stuff is added to the slab. This high-end concrete has all the right properties to receive stain/polish/epoxy.

If all are giving colour suggestion that is their own suggestion you will not be satisfied so do one thing took some outer inner all angles photo pics and contact Asian or Nippon paint service center they will give so many colour combination then you can decide

your staircase block is nice. use natural store cladding, if cost permits, else some nice stone designed tiles should also do the trick. as per the tile/stone, you can either go with the similar family for the rest of the wall painting. ensure the moldings/projections are painted in lighter tone than the walls, so that they do subtly stand out.