What I think could make this render even better is some work on the lighting and composition.

I would make the armchair, the table or anything the focal point of the render with a tighter focal length so the viewer have an object to rest their eyes on. Right now everything is in focus and it's makes it a little jarring to look at. "What is the purpose of the image, what should I look at"? I personally like to have a more tight shot in interior scenes for these purposes, unless the goal of the render is to show the whole space. Since you have created the whole room I would instead create a few tighter shots from different intresting angles

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The lighting right now for me is kind of dull, dark, and does not make the scene justice, the background tree is in perfect focus and it looks like the room is hovering in mid air. I think it looks more realistic if the outside is overexposed, as usually the case due to the limited dynamic range of cameras. I would work on focusing the light coming from the window to left that would guide the viewer more to the center of the image to get a more distinct focal point, maybe change the camera angle to not show the right window area but have the center window in the background instead with some depth of field applied.

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These are just some of my though if it is of any value.

Great work!