Luckily, from the very same issue featured in this week's Comic Book Legends Revealed, here is Herb Trimpe's depiction of the Thing's face, sans helmet (and yes, I could have just posted this as a comment in the Legends piece, but then I wouldn't get to have a post titled "Grimm Visage," now would I?).
I love that flies are buzzing around his eyes.
I wonder if he has blood on his saddle?