Its a really lovely room! what a great place for kids to share. I like kids sharing rooms. I think you need another colour to tie it together. I would suggest a blue tone.... teal, navy blue, duck egg blue. to tie it together. Its a little to pale and looks sparse, but actually isn't. I would leave everything exactly as is, BUT, paint the back wall behind the bed teal and find a simple navy blue wall decal that is fun and kid- like maybe one with a sillouette of a boy and girl playing. I would paint the wall behind the sofa duck egg blue. Then I think it would suit both kids more and look more kid friendly. the blues will balance the pink and cream, but because you have a pale carpet i don't think it will look too dark. don't worry about making it totally kid like, its a room they will grow with, not a kindergarten, and it also needs to peaceful and restful for sleeping. besides with their art on the walls and bright toys everywhere it soon looks bright and kid like. Good luck!

Hello P.s. , some guidelines for a better plan, 1) Two separate beds are suggested . The reason behind this is, as they will grow they will surely needs some ME space. 2) Provide more storage space as girls require more storage space. 3)Do not place mirrors on the wardrobe shutters (in front of the bed). 4) With a better plan you can utilise the space in a better way.

Parent's Bedroom 3D render & Elevation

Hey , you can go for bunk bed but instead of below bed u can make study table and book shelf and on the oppsite side of wall you can put queen bed ,and the remaining 3rd wall space ,you can keep wardrobes. see the image..this is just an example . you can have single bed on top .and down u can make as it is shown in the image. this also requires less space .