Try something like "Photo of...", "as photography" or "photorealistic". You can even specify the camera model and lens/exposure settings. You can find these in metadata of your phone photos for example.

Thanks for the reply buddy. But I am still not able to understand how camera model and lens/exposure settings can be used to make the photo real.

Lets, say that you took an image of a flower in a garden and ai has also generated an image of the same flower. When we see these pics side by side we find a lot of difference between them. Origin of my question was "how can we minimize this difference ?". How we can tell the machine that the more the magnitude of a certain parameter the more real it is, not sure if camera settings could help in this case.