good morning Rajbir kapur, instead of having a colured wardrobe try a mirrored wardrobe that will reflect and make your room look larger. but if u want a colour to go with ur walnut furniture then go for a beige or off white( creamish) laquer finish on the wardrobe beautiful in look and easy to clean. nowadays u can get wood panelling done on mica sheets . get a beige or fawn or off white colour mica done on your wardrobe( the doors etc) also the bathroom door do the same as ur wardrobe. .. wood panelling looks great behind the bed ( on the whole wall) but u already have dark walnut doors so u can just add panels of the wardrobe colour on the doors ( as in continuity contrast) . place your tv on a wall paper done up wall, or the wood panelling, or go for beige coloured stony brick wall behind the tv. will break the rooms colour cordination and make it look wonderful. have abstract or straight sleek cabinets below the tv. using the same laquer finish ( like on the wardrobe) hope these lil tips help u rajbir ji :)

as for your bathroom go for same beige marble and granite, do off white walls , wooden shelves same colour as your bedroom has ( walnut) . walnut colured wooden false ceiling with pop lights. do a golden framed mirror. add a dash of black granite in the shower area along with beige, and fawn marble and granite. do golden polished taps and showers and golden coloured handles on your bathroom hanging shelve cabinets ( if u do put up one) .