Generally any request for documents will move your application to the bottom of the pile. No one can really say how long it’ll take but keep in mind that applications are only processed on business days.
If they reject the photo again then it’s just a repeat of the process. My personal advise would be to just get a passport style photo taken at a business and get a digital copy of it as that is what they’re looking for.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.