Yeah I'm really uncertain as to why I haven't seen this piece before, but I do have a few points to add. There isn't much time left, but I know more can be done to help with your piece - the biggest point is that your piece is lacking a lot of focus i.e. there's stuff happening absolutely everywhere your composition is pretty good though so it's a matter of perhaps removing some things and refining that focal point, really show your audience where you want them to be looking. You also have a lot of colours going on, which can work well if there weren't so many things happening.. I think I see three different creatures here alone? If you reduced it to one, perhaps the tentacled monster you could really help the focus. I did a quick paintover, it's a bit sloppy but I hope it makes it a bit clearer. Like I said though it's a really complicated piece so working around so many different elements is difficult - What you have here is pretty amazing already it mostly just needs finesse and a bit of focus. Take my feedback with a grain of salt!
I basically gave more focus to the one creature in the back and the main dude, gave some focused lighting and a bit of contrast between your character and the environment. As there is so much going on, you really need to tone down some areas so that the eye can rest, it's important when it comes to planning and creating pieces that have a lot of chaotic elements

It may or may not be too late to take heed of any of this feedback at this point, in which case just keep that in mind for the future! Looking at your older thumbs I really like what you used to have, it was impactful and had good focus. But I think you were a little overly ambitious and it might've gotten you a little. Which is fine, being ambitious is great, you will learn to harness it a bit more in future! I did also notice that in your older stuff, you didn't play around with lighting, colour or thumbnails properly - more or less just went straight into the final piece (you had some sketches but I didn't see any planned light work, which really helps).
Anyway enough of my ranting, I hope you find some use of this, and best of luck to you in the contest and future artwork!