WIP: snow wars

Hi guys, this is the latest WIP project i am working on. the whole concept is about the some evil machine droid trying to capture some old treasure and battle between them. i am more or less satisfied with the out come but i am clueless as to how to really make it a stand out artwork.this is the actual render/product

from there i was trying some other stuff to add in like a spell circle kind of a thing,more defeated enemies to make it look more powerful

please help me with this on how can i take it a step further in overall look in anyway. no composition has been done till now.
Thank you.