I'd suggest a shallow bench underneath the window and flank the windows with a base cabinet on one side and a desk on the other. Then open book shelves above the base cabinet and desk. I can't tell what the dark wall is on the one end. The steps need to curve from the door to the wall. A smallish sofa would be great for viewing a flat screne TV and a square table and 3 chairs up against the dark wall would be a great place for puzzles and games. Put a pendant over the table.

First of all the images you posted you cant make anything out what you got there. Secondly you should contact a local Architect when doing something like this, not only for structural reasons, but window design as well. He will layout window detail based on the window sizes available from a certain manufacturer or you can take his drawings which indicate opening detail to a place who sells windows, and they have catalogs of window combinations and sizes to make it work with what you have.

What are the Carpenter rates at Bangalore, India for a Sliding Doors Wardrobe. Rate per Sq Ft. Room Size 13 x 13 feet. Wardrobe planned 10 feet to Lintel 7 Feet - Total 70 Sq feet front area of Wardrobe.

Min lintel height is 7' and cill 3' 6" from FFL.