how to get a picture for a Navigo Découverte

I purchased a Navigo Découverte for 5 EUR (for the card) and 22.80 EUR for a week's worth of travel on Z1-5. Apparently, tho, this card requires a photo for it to be legally usable but none-the-less the card was sold to me.

My questions are:

1. How can I get a photo for this card? In the US I'd go to Walgreens or a CVS and get a passport photo taken. Is that the same size of photo that I'd need for the Navigo Découverte? And if so then where would I go in Paris to get one? Walgreens / CVS's in the US are basically pharmacies - would a pharmacy in Paris be able to do passport photos as well?

2. How would anyone know whether or not it had a photo ID anyway? I imagine it's supposed to work like the London Oyster card wherein you just tap it against the smart card reader on the "turnstyle"

3. The Navigo Découverte comes in a plastic holder, which makes it several times thicker than a credit card / debit card. idk why it comes in this plastic holder but, none-the-less, it is unclear to me how to pull the Navigo Découverte out of the plastic holder or how I might put a passport photo into it.

4. The Navigo Découverte that I got looks different than the one depicted on http://www.navigo.fr/faq-passe-navigo-decouverte/. I mean, I guess it looks similar to the one on the right with the caveat that it doesn't have a micro chip. The one on the left also has "Ile de France mobilities" in the dark blue section whereas mine does not. Maybe the one depicted on the website is a newer one that'd take up less space in my wallet?