Single image HDR processing can be very successful. At the point of capture there are a few things to consider.
Shoot in RAW to capture as much information as possible.
Capture the light avoiding, as best you can, clipping in both the shadows and highlights. Use your histogram.
Low to medium contrast subjects have the best chance to be successful. (But as you can see from the images above, you never know.)
As always, if I can help, you can email questions.