In the wilds of my sketchbook. Done in a very low stress scribbly way.
And here is a snippet of life on planet x. They are gigantic creatures that plough through the ice crust to get to the organisms/algae type stuff below. One type has a shovel/skid which it drives along scraping the surface and through which food is filtered . The other has giant plough type appendage(s) trailing it which breaks the surface and other tendril types gather the food.
Also theres this sort of organic helicopter creature with a central tongue/grabber that plunges through and snatches food from just under the ice.I imagined a bit dragonfly like.