Off Flash Camera [First Try]

I borrowed the hotshoe and syncron cable from my friend to try off my off flash camera.
It turned out pretty difficult to control the FEC on the subject.

This is my first try so these are the result, i need to practice more on my off flash camera skill... arghhh so difficult...

I know its pretty dark too much underexpose the surrounding, one of the main reason because i want to get a fast shutter speed while not boosting up the ISO, and also because my nephews cant sit still, they are too excited too my flash, which i think they thought some kind of toy. hahaha....