Trey described the Remorhaz as possessing a fu-manchu mustache. A very apt description of this monster's facial appendages.
This is another David Trampier illustration, based on the original Erol Otus concept. While Otus may have conceived of the original design for the Remorhaz, Trampier has added all sorts of layers of interest. This picture appears in G2, The Glacial Rift of The Frost Giant Jarl, published as an AD&D adventure module in 1978.
Check out the back of the Remorhaz: it almost appears to be suckers or anemones sprouting from it.
A nice additional touch to this illustration that simply screams Trampier: look closely inside the mouth, and you'll see the feet of an adventurer, recently swallowed by the beast.