I didn't screen this shot but I don't think compression was a primary rejection reason here, there are traces of compression if the image is equalised which could probably be avoided by always saving your edited JPEG at the highest quality. The file size on this shot is quite low at 248kb which is getting down to the kind of size where you might be risking compression becoming visible.
I think the primary reason is probably the fact it's a bit low in the frame, you should get a more balanced image if it's a bit higher.
This isn't mentioned in the rejection but to my eyes the contrast is a little off, slightly lacking darker tones and overall a bit on the bright side. Here's an example with a couple of minor tweaks to the overall brightness and contrast (I had to crop the copyright bar off to see what the histogram was doing so I've added your name over the tail):

Hope that helps!
Paul
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