I don't understand that the term "approach profundity" requires further explanation. But let's say that in the spectrum, the gradation of the sublime, profundity is the ultimate endpoint. Beyond this may lie madness.
No, I don't mean to ignore what the photograph is a picture of, but the work, say, of an Ansel Adams is quite generally regarded as art. I have a wonderful book titled Geology Illustrated written by a geologist who is also the pilot of a small airplane and a skilled aerial photographer. Many of the photographs, if framed and hung in a gallery, would be lauded as fine art. Here is a convergence of sublimity and profundity. While the photograph as an object is not profound, the thoughts and feelings that it induces are of the profound, the extra-human profound. In the case of the geologist, he offers photos of deeply eroded anticlines in Wyoming that illustrate to the imagination the vast forces that folded up the anticline and then the eons of time that eroded it down to a skeletal outline of itself. That is profound; something well beyond our quotidian existence. A suggestion of Shelley's Ozymandias but on a far more vast scale.