I got real good at interior design from watching a lot of tutorials. Shove a “desk” up against a wall with upside down stairs, some slabs, and/or some trap doors. Flower pots, candles, lanterns, item frames, bookshelves, barrels, turtle eggs, pickles, glow berries, vines, and leaves are all good decorative blocks
i’m gonna be honest i sometimes look up ideas off google or pinterest 😅 i love the unique designs from pinterest tho so if you wanna check that out i highly recommend!! i think you should use different wood to add some color. for the bed instead of slabs use stairs, it’ll make it look cooler than just being flat. i play around with stairs a lot and make designs with it being upside down or making it into a table with slabs to add space! try adding carpet to add pops of color!