Lighting looks a bit uniform, get some shading in there and some shadows, i.e. under the table. Some subtle blue lighting coming from the blue tubes? can add some variation to the lighting.
The floor texture is heavily repeating and very obvious, you could try blending another texture in to break up the tiling.
adding to what Ark said. I would add more detail to some objects. Right now all the objects on your scene too simple and uninteresting. Add more details (modeling and texturing) to the tables and specially to the center operating table which is your focus right now.
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The floor texture is heavily repeating and very obvious, you could try blending another texture in to break up the tiling.