Yeah perhaps, worth seeing if changing the floor tiles to something else would improve it, they feel a bit like kitchen floor tiles to me. Even wood might work better. Concrete can be awesome, I remember Novaria in Mass Effect had a kick ass commercial industrial concrete style. I guess this all depends how far down the arty direction you want to go. One thing is for sure, concrete rocks in the right hands.
If your goal is to have it not look well maintained, the plants needs to be dead or getting close to it, any well maintained plants go against the feeling of neglect. Opening up a few of the ceiling tiles and having some cables dropping out is a classic way to make it look a bit messed up. Could also try cracking a floor tile or two nearer the walls, or even remove one and have a replacement put in that doesn't match the color perfectly. An out of order vending machine comes to mind also. The devils in the details, but they matter if your trying to tell a story in a small scene like this.
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