What I would do is to crop it just below that window in the right side. Then I would play a bit with some layers masks and lighting effects to emphasise the light on the first chairs and then how it dissipates on the last chairs. Or I would even the light on all chairs as much as possible. Either way, I would "pop" it up a bit.
If you have the raw of the file try a HDR from at least 3 exposures, play around see how it goes.
Good shot.