As just judging by the picture alone, that looks alot worse than my screen. I it (yellowing) noticeable even under regular light? Mine is practically gone just from lowering my brightness level, no stuck pixels or dead pixels.
You might want to post some pics from further away and under normal light to gauge better.
Judging by your pictures I don't think any amount of adjusting the brightness would help.
I would take it back.
Yes it's noticeable under bright light / dark light and at a range of screen brightness settings. I'm going to the apple shop tomorrow and just hope they agree with me there and then that this is not acceptable and offer me an exchange.