Plants, dust, something you have on your desk… or on the floor 
(This shelf is useless because it’s almost empty.) … maybe a cat 
… nice so far
Edit: after seeing this An interior - just for fun and learning i recognized what i was worried about: the inner lights are on but there is bright light in the windows… okay the shelfs are also almost emtpy ans the open window with sun is super vfx and maybe for architectural render not so wanted but a blurry bush outside and/or the silhouette of the next building…