I takes a while to look through that "barely noticeable" watermark... lol

I like your scene. Couple of things though: The tubes on the table looks huge. Don't know if they really are that big but they catched my eye. Another thing that might improve the image is to lower the overall color saturation. Could be done in photoshop...

Maybe a subtle fog (like dust in the air) and some depth of field could improve the realism too...