I thought the original pose was quite aggressive and so the overall idea was to try and enhance this mood.
I've cropped it to change the composition, I find the person slightly off centre more pleasing to the eye.
As the background is not too interesting and distracts from the person, the combination of cropping and the heavy vignette effect ensures their is no doubt about where the eye is focused.
The face is quite dark & not too sharp, so I decided to up the contrast such that the face would no longer be visible, this draws attention to the position of the hands, which do look quite sinister.
I saturated the colours up to make the image a little more vibrant, this really highlights the areas that are lit and I like the contrast created.