some suggestions i have (besides beds, which youve confirmed u wanna add) are: black boards for the post-its, different angles (example: flip objects that are horizontal to be vertical aswell, and add sprites of side and back for some important ones, like the tv!!), candles (additional points if you add religiously significant stuff like jewish or muslim items), smaller or different pillows, bed covers/blankets, characters sitting down, more plushies, keyboard, more electronics (small radio, telephone, consoles and smartphone are options!), armchairs, and as a personal request, more silly little animals/plusies (like frogs, bees, axolotls, cats, dogs etc) and masculine characters!!
i will be tuned for anything really, im very excited about what you have to show in the future!!