First thing, im really liking the Base, especially the Water and that Little Croc! The Colour of the water is perfect.
But, there are some Things id like to Point out:
For this type of effort im missing the Story! What is this Orc doing by the water? A Diorama should Always be telling an interresting Story, this guy just seems to be Standing at the water, wondering about beeing bitten anytime soon., which seems odd, cause hes not been bitten yet, that actually would be hilarious…
Second Thing is contrast and Colour saturation, the whole Scene seems to be more or less tone in tone, my eye just doesnt get caught anywhere, which enhances the Feeling of randomness for the whole piece, but, if You ask me, this also has something to do with the Scene, because i myself wouldnt really know which thing to highlight, because i dont know what is the point of interrest in this piece.
Technically it is still very well done and clean, i think i rated it 8, so excellent Job!