The transition of style is fine, but it's bloody hard to mix aspect ratios in a set & pull it off. At the moment it looks as though you've shot the miner shot then just sort of mangled it to a totally different composition. It looks as though it was probably a landscape shot which is now vertically taller. By a bit.
The issue is less that it makes the miner shot look weaker (although it
does) and more that it implies extensive messing about with the other shots. They're all strong compositionally but have you just got a fancy shcmancy high resolution digital wotsit, shot a bunch of so-so shots then gone to town with fine tuning or even drastically altering the composition afterwards. It's just one big implication of weakness in your work.
I'm being overly harsh here, and this folio would probably get you in - but if you've got the free time to spend on it then work it all you can.
If you really can't bear to make the miner shot into a 3:2 then try adjusting the folio so you've got more than one square shot (and actually make the miner square). The 8th shot would make a strong square image. One totally different aspect ratio is jarring - anything more starts to look wholly intentional.
Also tidy up the aspect ratios of all the rest of the images. There's really no need for them all to be squiffy one side or the other of 3:2. I know you said you would but actually do it.
If I'm cropping an image I always lock the aspect ratio. Most software is happy enough to do this. Most will also let you lock the aspect ratio to something else entirely so that you can easily turn say a 3:2 image into a 1:1 image et cetera.
This all seems incredibly anal, but having a solitary strong image is one thing - having a set of strong images that flow and work well togethor is another entirely, and the aspect ratios thang is step one of how to not make them sit like crazy paving.
Just be thankful you're not printing them!
