Hi Sppirya, Did you use glass flooring in your space? Looks great here:

Unless the owner or the landlord permits it normally you can not make any permanent structural changes. A drop ceiling would be that. What is the issue with the current ceiling?

Hello there, i would suggest researching a little bit for locally available architects/ interior designers/ design-build firms online/offline. Then try finding professionals through houzz/ other online service providers. Regards, Aurum Ideas and Spaces Bhubaneswar

Hello Shivani, For antique look, you can use an indian wooden swing as one seating on one of the sides of the seating, for wall treatment you can also go for pop textures with rust color on the wall. For the sofa go for a light color like beige or creme, with bright color cushions. You can also go for one seating in a contrast or bright color. Attaching reference pictures.