I have collapsible backgrounds and whatnot but for mine just sat 2 metres in front of a plain white wall and aimed off-camera speedlights into corners behind camera for flat lighting. I took the rules to refer to retouching, which of course I did not do. However, all images are "processed" according to decisions we make, even straight from camera, so I shot raw (as always), converted to TIFF, and adjusted levels. Sent as a JPEG, accepted, no problems at all.
Poor sods are probably inundated with invalid pictures from the vane and ignorant, if dealing with ID applications at work is any indication. Headphones, sunglasses, pimp hats, scarves, fascinators, and every other non-prescriptive headwear imaginable; head indistinguishable from cluttered or dark background; stood right under a spot so everything burned out except face lost in deep shadow; facing away; chunk of head cut off (if only); black & white (poorly done too, but that's just personally irritating); hammered at a party; at a beach in swimwear (possibly flirting, but no thanks, I fear our children will inherit your defective brain gene); wearing a life jacket (are our health & safety precautions inadequate?), fully made up in wedding dress with tiara and bouquet (yes, lovely, but we can't recognise you any better than your betrothed could on the day); neck-deep in a swimming pool; picture less than 100 pixels a side (how was that easier???); photo of a previous and already crappy ID, taken with a phone (casting half in shadow), at an angle, and out of focus. Because absolutely anything is preferable to just performing the simple task asked of you, isn't it?? Seriously, people know what this is for, right?!? We all just want to get on with our lives, don't we?? No! The doors stay locked! And who has the keys hmm?? Right! What?! Ooh, listen to the sudden safety expert. Sit back down! I'll decide when the "fire's getting out of control".
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Uh
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Sorry.
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I'm...
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just going for a walk...