Based on that picture I'd say something is not right with the backlight. I see the dark band on the second quarter from the top of the panel, which I don't have on a similar uniform white. The darker corners is a normal photo/lens characteristic, so probably not present on the actual monitor.
Slightly darker left could be viewing angle difference as it is taken just off centre, so I rather not pass a confident conclusion there.
Slightly darker left could be viewing angle difference as it is taken just off centre, so I rather not pass a confident conclusion there.