I guess your mulitple light sources are your flash and the sun? I see the sunset lighting the back fo the duck. However, teh face is still a bit dark, even though it looks like a light reflection shows up on the beak from your flash or light source. The water is kinda brown, so not the most attractive for a photo backdrop, but the reflection is nice.
The texture of the water is really nice. Wish the eye was more prominant and the white specks were more subdued - almost looks like the poor bird has duck dandruf.
you say you used multiple lightsources (I only see sunlight reflecting on the water and maybe some kind of red laserlight on the bollocks of the duck?? If that is your second light, it doesn't really show..), but you still managed to underexpose the duck's face!!