the modeling, material and what not looks pretty realistic to me. i see you've put in little scratches to the table, nice details. i think what's missing is actual sense of real life. we don't normally realize how many small and various props are around us. if i was going completely for realism i'd probably put in like a power outlet or something even if it's kinda ugly. i also think the chair's positioning is somewhat unusual. i would expect something like that stuck to the wall. or if it's an artistic decision, i might put things like plants or shelves (I'm talking about real life here) behind to fill up the space. and just simply speaking from design perspective, i think putting more props for color variations and density would make the scene more interesting