We can't tell you that lol. Honestly, You have to experiment because it depends on the camera settings and obviously the environment settings. If I were to tell you it would take the fun out of itguys need some input on how and where to point the flash and at what power level to get this sort of an effect using one speedlite? I know multiple shots need to be taken just where exactly to bounce the flash from and power level.
thanks
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All I'll say is start high and work your way down once you dial in your settings.