There are a few ways. You can install wood panelling. You can wallpaper faux wood /veneer style. Or you can paint it faux wood. The latter 2 are possible because it's on the ceiling; far enough away to trick the eye.

hall is rectangular and I want max space

Dear Mr Vijay, I suggest that you go with a cnc design for your hall with a rectangle or square sizes in 4'x5' or 4'x4' for laser cut panels , back-lit with warm LED lights, and rest of the space a recessed false ceiling with led lighting within and for your bedroom i suggest a warm/light brown coloured wooden panel within POP false ceiling please find images as reference for the suggestions thank you for further, you can also contact me on ph 9886894865

With baby pink walls, I'd have to agree with Reas, a soft white sheer drapery would look nice with pink and silver tones!