So... just suggestions as to what would look cool? I'll see if I can brainstorm anything good- your work to date is definitely appreciated.
A transmuter, mid-transformation, could be very visually interesting. Kinda split along the body's axis of symmetry- on the right you see the mage still casting the spell, as the left deforms and bulges obscenely into a giant spider or dragon.
A nemelex worshiper could be neat- a character posing with a drawn card, while one of nemelex's symbols of <summoning/destruction/wonders/ect> floating in the behind them air as an ornate glyph. I think glowly symbols things are something that would come off well in your style.
The orc or goblin tending the stone soup is pretty fun, maybe another image of the more mundane life in the dungeon? An off duty group of one of the sentient pack species (orcs, kobolds, yacktaurs or something) hanging out around a fire, rolling dice, eating diner, standing guard, falling asleep at their posts to be later stabbed... =D whatever.