If you want to highlight the staircase wall then your could use earthy colours such as a yellow ochre! The wall could be enhanced even more by using suitable frames and making a good collage composition for all the photos that you have (I can see many lying on the dining table). This colour would match well with wooden furnitures

Pista green color looks good. I was actually looking whether we can make something to contrast the blue glass windows.

My first suggestion would be to change the layout of the room at bit. this is my suggestion:i also think that you should paint the room in a uniform light colour (preferable white) and also paint the wardrobe in the same colour so it doesn't overpower the entrance and blend in with the room. my second most important suggestion is to increase storage. here are some ideas for that: simple plank shelves with filing boxes and folders with labels can be a cheap and efficient way of storage of study material. here are some links for such folders and boxes: https://www.amazon.in/Elan-Bookshelf-Executive-Certificates-Certificate/dp/B00HWRHKOS/ref=pd_sbs_79_11?_encoding=UTF8&psc=1&refRID=BQE8PBQNYQYXHHDEBAVQ https://www.amazon.in/Corpac-Multipurpose-Durable-Plastic-Storage/dp/B01GBBHT1E/ref=pd_sbs_229_40?_encoding=UTF8&psc=1&refRID=1CC92M79MCJDPWBD53H9 https://www.amazon.in/Aristo-Basket-Medium-Without-Multi/dp/B06WGR811H/ref=pd_sim_229_4?_encoding=UTF8&psc=1&refRID=JD75V1WW64930CV4NG69 Also the sunlight is the biggest asset of the room and yet the aluminium window is an eyesore. so i would suggest some nuetral shade curtains. and you can play with the colors of the room with the bedsheets. And agree with studio chippan's suggestion of a painting or a family portrait or frame certificates of the kids achievements. Best of Luck, Purva Saksena (Architect)

Gm Dipti... color shade are particular to the area in general if u want the suggestion. Adding a color shade chart .