I would suggest adding some color variance on your textures.
For example look at your wood texture, its the same 3 colors all over. Look at the example i found below, you can see how the artist added some hints of green and yellows here and there. If you were to take a second pass on all your textures and keep this in mind, I feel that the quality will increase a lot
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Try using some HDR
Also the mesh you're using is very squarish, but that's personnal taste.
For example look at your wood texture, its the same 3 colors all over. Look at the example i found below, you can see how the artist added some hints of green and yellows here and there. If you were to take a second pass on all your textures and keep this in mind, I feel that the quality will increase a lot