I really like this. There is a very good feel to the whole scene. The two main suggestions I have are that the man looks very polygonal. (If that’s a word) Did you use smooth or subsurf for him? There just seem to be some fairly sharp angles in the geometry.
The other thing was the water. Like I said before, I really like the style here, but if you’re going for a more realistic approach I thought I should point out that the low points in the dips of the waves look like they’re whirlpools. The very bottom left corner especially has a sort of spiral look to it. At first I thought the raft was getting sucked into it.
Hope these suggestions helped.
-Anthony
nice modeling job… i would play with the lighting a little
To me it looks like the raft is hovering somewhere above water instead of floating on it, that kind of small raft would be atleast half way down in the water…
Another thing is that the raft and the pieces looks like they came straight from a shop or factory, instead of handcrafted by man lying on them, it just looks too clean IMO…
But I really enjoy the mood that is captured by this image 
-deadend