...Are there any photos I should definitely take out?....
…...I only shot two games of night quidditch with the 6D thus far so not much diversity of players.
8948 absolutely has to go. Porta Potties in the background, eww.... Can't see #6's face, I don't see anything in this shot worth salvaging, I would have deleted it in camera as 'not a keeper'.
A better shot of this scene might have been shot from a position several feet to the left where the background PPs could have been cropped out in the view finder while getting a more frontal view of the players.
8708, YES!! She looks like a super hero who forgot her cape, she be Flyiiiiin'!!
But, in this shot as in many others you have that tilted horizon. One, maybe two intentional (or even accidental) tilted horizons would be sorta OK, but even then, the angle of tilt should be different so that the tilt looks intentional.
You have so many tilts at the same or close to the same angle, it looks like maybe you were shooting from a badly set up tripod.
Back to 8708; rotated ~13.5 degrees clockwise gets the horizon level and there's still plenty left to crop, enough left you can even remove the building and parking lot completely.
Backgrounds; 8948 as already commented on, the bus in 8658, in my opinion, renders it unusable too.
Backgrounds in many others include elements like sidelined players, bleachers, spectators, referees, even some nice landscapes. For me at least, all these backgrounds help convey a sense of place and atmosphere totally appropriate to the subject(s).
I quite like 3466 as is, I think it rather enhances the set.
edit...... I really really really like 3466, indeed!
This one I'd print and include in your on-line portfolio.
Aside from the tilt, I quite like 5369 even though I can't make out what the point of contention is. That's fine too though, often what makes a good photo is what isn't shown that makes a viewer stop and wonder and think.
Something about 8592 is just boring for me, especially compared to 8287, 8249, 1814, really most all your others.
1912 plays odd for me, it's the out of focus #37 in the foreground. When I say 'it plays odd', I mean to say that it looks like a discard in the small shot in the main gallery page, yet full screen it looks pretty good. Rotate about 8 degrees to fix the tilt, crop the corners which also removes a lot of #37, this might be a good one for your print presentation.
Regarding the on-line portfolio, as already suggested, if you've got the gear, bring the portfolio with you on a tablet or laptop in a pre-configured and easy to navigate slide show. Have it duplicated on-line too so the interviewer/reviewer can choose how to view.
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According to common internet rants by spec readers, 7D and 1D owners, it's just not possible to shoot sports with a 6D, who do you think you are proving them all wrong? Good show!! .