The Easter Bunny exists. I have hard evidence. I saw him in my neighbor's yard and I took this picture. That's right, this picture is proof the Easter Bunny exists. You're welcome.
You might be thinking, "But wait, Carolyn. That looks like a regular white rabbit". Well, I am here to tell you I saw him materialize out of thin air before my eyes, and he actually said, "Happy Easter" in a squeaky little voice before he left a beautifully dyed Easter Egg for me and vanished.
You're convinced now, right? Of course not. When claiming "evidence", one picture does NOT tell the whole story. That is why it is so important to take good control shots of the entire area, as well as comparison shots: taking a series of consecutive shots from the same angle and position. Video is extremely helpful to rule out other causes of an anomalous picture (as well as audio).
If you present a picture that looks like exactly like thousands of other dust orbs, or thousand of other breath mists, or thousands of lens flares, you don't have anything to convince me you caught anything paranormal. A single picture of a mysterious mist or eerie light doesn't tell me it that materialized right before your eyes. It doesn't tell me a phantom voice accompanied it. It doesn't tell me your teammates saw it too. (Even if these things did occur, there are many natural explanations to consider anyway, but that's another topic).
The burden is on us, as paranormal investigators, to present extraordinary evidence. It requires more effort and patience. You may indeed catch something paranormal in a single picture. But without any other objective data to back it up for others to analyze, it cannot be considered hard evidence.
I have to go now - the Easter Bunny is chewing up one of my rhododendrons.