I think that you need mostly white, but something in a print that incorporates your colors. Perhaps pillow slips or at least a mostly pea green painting/poster/wall-hanging that also has some brown, perhaps in the frame. You could also do a stencil on the pink wall using the green paint, some white, and some brown. How about a nice tree branch? You can also buy vinyl decals from Etsy or other places--not sure that you could get pea green, but brown and white should be available.

Hello Vipin, As the floor is dark green I would suggest a biege sofa, a very very light yellow colour for walls, light yellow and biege plain self designed alternately placed curtains, brighter yellow and dark green (as that of floor)alternating cushions and an orange base painting with white yellow and green on it on one wall.Hope my suggestion is of some help to you.

@Cornerstone design studio: Apologies for making big post; thought that more info will help. @Rupal ji, If it sounds like I dont need any changes; my apologies for that. Let me put it in short,"I am looking for options that give modern facilities without leaving good things from old charm/ comforts. " Thanks for the straight forward comments. I shall try to edit my original post to make it simpler and that looks open to new ideas.

Grey is trending big time now. And don't worry about it being too dark. You can offset that with a white counter top, white dado and steel accessories and of course interesting lights