I think most people who are regular contributors recognise the point you are raising, but this is a problem that is hard to avoid with 30 odd individuals doing the job.
A reasonably large screening team, doing things at different paces, in different personal moods etc, then variability like this is simply bound to happen.
As a MAN
photographer myself, I too would say that your SIA shot is incorrectly levelled. Here is a recent shot of mine taken at almost exactly the same point:
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Photo © Paul Markman
There should be a slight slope on the runway there, as you are not perpendicular to 24L from this position. Also, most screeners will have screened many rotation shots from MAN
, and so will be very familiar with this vantage point. The background hangar in your image confirms the need for some CCW rotation. So the first screener may just have spotted that first and ticked 'reject' for that alone. Others may give the photo a thorough 'going over' and give you the whole story (particularly if they are working at a slower pace) - and I would have to agree again with those reasons. Having said that, the second edit above is markedly superior to the first.
The quality is not ideal, in part due to the lighting. The grain is apparent and the centering is not in A.net style, because you have cropped very close to the nose, but not balanced that with a close crop to the tail on the right. The softness may be particularly the rear fuselage, always tricky from this angle due to the jet efflux. I would still argue that the level is wrong in the second edit
There have been pleas before for screeners to get into the habit of indicating all the problems with a photo, rather than focusing on one, when there are more. Many report the frustration of getting a photo rejected for one reason, only to correct that and then get a subsequent rejection for another. I am sure the screening team are aware of this issue.
Good luck with your photos, and I hope you get better conditions next time.
All the best.