Of course my try is not so good as Colin's.
It's normal.
But about this photo I have to say:
The weather looks dull and cloudy what doesn't help.
The frame is / was too tight. More room in front and more room at the back of the boat would be better
Why not the hole boat ? Vertical shot ? with lots of room around to frame easily ?
Try to get bolder angles, like shooting right in front of them or from behind...
Are they going fast ? Pan a bit trying to get your friend frozen.
Use raw file to get some detail from the whites.
And here is my humble try Nicola
Again Nicola, I would like to be not so telegraphic but again, I have to go. Sorry man !