Looks like you may already have a little bit of color blocking going on, but I'd increase the contrast between the shades of paint. Do you have access to the original paint chip card? Paint two of the walls in question in two different shades from that same card. Consult with the paint source for the complimentary color to accent the third wall. I think the middle wall to the right of the stairs would be the one I'd accent. Then add a large piece of colorful abstract art to that wall. Here's a quick tutorial on color blocking. https://www.houzz.com/magazine/building-with-blocks-of-color-stsetivw-vs~639

it appears you need storage. I would get with a storage professional on how to best utilize the space based on your needs.

There are actual rules about staircases as to riser height etc so best to get an architect involved in the process this will take up a lot of sq. footage too.In many places a spiral staircase is not allowed only if the elevator can hold a stretcher

Hello Ramakrishna M, This question sounds more for a structural engineer. Also you will need to check if it is legal to do it in your house in the first place especially if you are planning to make an RCC staircase. An Interior designer can help to beautify your space and provide advice on the planning at the max. I could not answer your question directly but hope it puts you in a better direction. If you need Interior Design services feel free to contact us: 9820942680, designospire@gmail.com, Follow us on Facebook @designospireIDS www.designospire.com