Thanks all - appreciate the comments.
Back-story: as mentioned elsewhere, this is a shot I did not intend to get when I set out that morning, I was on another mission altogether (birdwatching). Still, the shot was there, I took it, and it turned out pretty much how I pre-visualised it. Happy me.
I compensated this unwitting model by buying some fish from him, and a while later used the fish to lure the real object of my photo-mission that morning. Here is model #2 coming in for his breakfast:
[attachment=22647:Baringo_..._SS_2876.jpg]
So a pretty good morning all in all - got what I wanted and more.
Ed