Article 15 says you have the right to request the data and they must provide it to you.
Article 20 says you have the right to get your photos back in a machine readable format.
Sadly, this only applies to those in the EU. Americans can keep taking it, which makes sense as it's an American company that's giving it. Sigh.
Technically, you don't have to be from the EU. You just need to be in the EU (which includes Americans who are just vacationing in the EU).
If I understand it correctly, the GDPR applies to any company that does business in the EU and it doesn’t even matter where the data subject is located or which country they are a citizen in. So even if you’re from the US, you should be able to make a valid GDPR request.