Hard to say when it’s not better resolution. But is it in focus? Is there noise? What is your iso setting? I would say that it is a a bit oversaturated and maybe a bit overexposed.
It's a bit hard to tell as oleschwander has said, however as it was rejected for technical reasons, I would suggest white balance is a bit out. It's just a bit too blue/cool, so you need to warm it up a bit - for example:
So maybe the reviewer was thinking about this. I can't see any other problems at this resolution.
Thank you all for your insights. I find them all very useful in making sure I avoid similar mistakes -- during editing-- mostly in my submissions. Ilse