Taken in a violent storm during a trip to Lago di Garda. This actually shows two different lightning strokes that happened in short succession during the exposure.
I consider this to be the best picture I have taken so far. Ironically, it was taken during my first shooting ever, only a few days after I had bought my first DSLR. Natural light only.
A peaceful moment, sunlight streaming through the windows. In a nearby room, three other people were hectically taking turns shooting with the pro flash equipment we had rented.