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It seems that your main light source is not strong enough, and the shadows are to hard.
Another thing i think it need for realism is less homogenous light and colour. Almost every material you use in that dinner reflects light and colour so i think you need to make a little mess in that aspect.
Hope it's understandable what i'm trying to say XD
Those windows aren't visible in the render.why so small the windows? i'm not from there but seems odd a dinner with that tipe of windows XD.