Hi Raghu, You have a nice plan. Generally staircase need a little bit more space than you put on plan (6*14 feet arround). Steep staircase is not useful and accident prone. Why not put your shop under the staircase? I mean to say that extend the staircase to the shop area, put the storage of your shop under the staircase and exted the selling area to the boudary wall. i see some gap between the boundary and the main house in the northern side. Fill the gap by extanding the shop. Do not cover the roof with concrete slab on the extended area between the staircase shop and the boundary wall, rather cover it with corrugated roof sheet (like tata shakti tin). Secondly, you put space between the boundary side and the west wall of the house, Your eastern side is closed with other house common wall i think. Generally western side is more hot in our country. So, you can rather closed the gap in the western side and open the space in the eastern side between the boundary and the house. Thirdly, why not put your bedroom in both side of the toilet. Extended the toilet to the hall. That way you get more space for the bedroom and bath in the rectangular size. If you do not like that your bath door open towards the hall than place a free standing tall cubard/almirah/bookself/ kitchen storage unit in front of the door, it will cover the door and make a small corridor like space for the bath entry. Fourthly, go for large window. I suggest wall to wall, floor to ceiling. Some one think this is rediculous and not feasible in indian houses. But my personal experience says that you can not beat sunlight by any other things. Sunlight is the beast decor idea and if you have sunlight at your home from sunrise to sunset, you donot need any colour, decor item and beautiful accessories. My house is only 600 square feet two BHK one storey house with lots of windows, flooded with sunlight. I have even opaue polycarbonate sheet in my kitchen to get sunlight from the above. Fifthly, make small jaali spot just below the concrete roof in all the open side of the house for the cross ventilation. Sixthly, do not put many wall in the house. It make the house feeling as more small. You can half the wall between the hall and kitchen, so guest can not view the kitchen but it also not fully closed. Seventhly, use multipurpoe furniture like sofa bed, coffee table cun dining table etc. You can check on houzz photo, pinterest, youtube for these kind of furnitures. And last, but not the least, follow minimalism. less thing in house (to store, to organise) is more time for life. For Indian it is much more necessary as we have very little space for creating home.

also plz suggest elivation plan

one more change

I feel partitions are not needed. You already have too much for the space. Adding a partition will shrink the space further. The simplistic solution, you do not wish to discard any furniture would be to paint all the walls in lighter pastles. And use some wall painting frames to highlight certain walls.