Hello !
I agree with what has been said, to dive a bit deeper I played a bit with the image :
First thing I did was to simplify it so it’s simpler to analyse and manipulate :
Colors are picked from your render…
Some issues are showing up but it’s even more obvious when we turn off the colors :
Basically readability can be improved a lot, it can be argued if that’s part of the composition or not… To me lighting and value control is part of the composition, since values/light help to define the form and composition about moving forms to control the eye and readability.
By tweaking the value the composition is much more readable even if we didn’t move anything… again it’s up to you to consider that a later step in your workflow, but you might consider paying attention to shape separation from the beginning and push things even further when getting into lighting.
Now, I think the overall composition work, but it’s a bit sad that nearly everything interesting is in the center of the image, you don’t take much advantage of the vertical frame. Therefore we can try to exaggerate things a bit…
Here I got rid of the background to work on the main elements and how they play in the image, trying to occupy as much space as possible.
It’s not always what you want to do, but in that case I think it can work…
Now that the main elements are there it’s easier to add rocks and secondary elements in a way that help readability…
The main idea is to lock access to the border of the frame, and to add leading lines, it’s not perfect yet but it’s a basis…
Then I keep working on it, adding more elements to lead the eye to key points,
and now that I took a stepback while writing all these I would probably go back and keep tweaking, probably the arms of the creature to start with…
Anyway, hope this will help you to spot a few areas of improvements !
It’s a pretty fun subject you’ve got here, I’m sure that will lead to a pretty cool image !
Have fun !