"You look great! We just need you to blink 5 times, and you're almost done!"
"Almost done! Just show us your best side and turn your head to the left like shown above."
"Of course, you only have best sides. Just turn your head to the right like displayed above, and we can continue."
"You've almost got it! Please open your mouth and show us your teeth."
"Wow, look at you go! Just one step remaining: Tilt your head to the right like shown above."
"Now, to complete your verification, hold your national ID beside your face. Make sure it does not obstruct your head! We need to be able to see your pretty face!"
(Tongue in cheek, of course. But my banking app actually uses this kind of language, even for verification stuff, and I don't like it :D)