My guess is that you are talking about the reflections on the surface of the glossy print itself. In pp, the only way to mimic this would be to artificially create some reflections on the digital image. This is possible, but requires some skill and knowledge of lighting.
|Valley by the light of a blue moon by cjf2|
from Down in the Valley
|Lake Erie Stone Pier by yobbyt|
from Dock or Pier