depends on what material you can provide for the covers the 6 hours might work. if on the other hand this has to be done as well i doubt it can be done in less then 10-15h.

personaly i would keep the ingame shots for the back and try to find a symbol like cover that fits your game for the front. this is more powerful especially if you dont have a gfp power horse game but focus more on gameplay.


something that pop up my mind right away is the hive/web/cluster look of your playfields. i would addapt this idea into the cover instead of those paper and stone look.
I dont know much about the gameplay but i assume those fields will be vital for it.

I would make (just a suggestion):
An old ancient building site of those huge stone blocks (a field of them as your playfield looks like). i would add some characteristik humans and construction workers into it. Those are place right now the last big stone into the ground to seal some sort of treasure or grave. (some yellow rays come out of the small pags to indicate something important gets closed away).

something similar like the pyramids and the old egypt paintings. where workers move those huge stone blocks with some wood stick and simple cranes to create something monumental.

just an idea though

cheers