i dont want to mean or anything, but i don’t think thats going to come close to winning in the contest, sry.
The render, just looks like garbage.
Also, your scene is not telling the reader anything, no story, no deeper meaning, its just simply two creatures attacking a man.
There is no emotion in either the man, or the machines. If you are only going to have those three characters, and a simple wall as a backround, its simply not enough detail. Simply put “its boring”
The contest is supposed to be “spectacular” and i dont think this render shows it.
this is all hard critique so, dont take it hard.
A few things to improve this render: (i know you have no time, but if you happen to work on it later)
A much more complex backround, if you arent going to tell the story with the three characters, tell it with the backround, i have no idea what your concept of a story was so i cant really help you there, perhaps create a much larger battle?
I would scrap the mech, and re-design it, i don’t find it all to appealing or interesting. Though i do like your human character.
The three characters, should have better poses, especially the human. He needs to be doing something other than standing there, have him about to strike one of them, crouching to miss one of the stabbing stinger thing from the machine, have him trying to fight off near death, HE NEEDS EMOTION! Make the reader have sympathy or hate for him, i know all of these are daunting tasks, but this is a contest in which professionals all around the world are competing in, the bar is set high.