Mostly no — not the casual kind. Lighting, wet or dry hair, hair length, angle, part position, and camera distance each change apparent hair density more than months of real biological change does. A clinic can make almost any result look impressive by varying those, even unintentionally.
For photos to mean something, everything except the hair must stay constant: same positions, same lighting, same distance, hair in the same state. That is what standardized imaging means, and it is why Uberhair network practices use GroTrack imaging rather than a phone camera and goodwill.
The practical advice: before starting any treatment anywhere, insist on a standardized baseline. Without one, nobody — including you — can honestly say later whether it worked. Individual results vary.