i willl add my so called words of wisdom, and whilst i appreciate your enthusiaism, your execution is somewhat lacking. dont take this the wrong way, but, this seems slightly thrown togethor. the 1x8 red technic brick destroys any aesthetic value in the piece. maybe you could try to replace the bley baseplate with a more 'jungle' coloured one. green or tan, then maximise your foliage, the concept of the 'amazon', should really include much foliage, far mare than a small tree, and a handfull of organic pieces.
your water fearure is somewhat interesting, but is far to 'square', dont make the water as a 12x32 block, attempt to simulate the organic curves of a a natural water source. instead of an epic river, you create a resevoir. your temple is intersting, although slightly raiinbow coloured.