the window looks really dirty with the branches up against it. If I were you I would try a new camera angle lower to the ground perhaps. Just have a play because everything feels very stiff at the moment, no nice flowing lines leading the eye
I like the window material. The room does look a bit distorted. I think the bump is too strong for the white painted wood material and something is wrong with the floor material. I can only see the reflection color.
Nice room. I like the bookshelf.
The wood stairs look a little bit unrealistic: too massive. I think it would be a good idea to use separate planks.
The window itself looks good. But I don’t understand what there is outside. Looks like dirt and mud or a really overexposed picture. You could use two planes: one strong emitting but invisible for the camera and another one less strong for the background.