Very nice jungly feel; the lighting is great and the dirty swampy water is really excellent. Composition is good too, it's got an air of expectation. I'd be inclined the put a palm-trunk up really near the camera on the right-hand side and wrap a snake round it (if you have Poser) to give an idea of the mysteries and dangers waiting for the guy when he paddles in (it would blot out that unwanted bit, too). However it's your image, not mine... ;-) 
Finish it, it deserves it.