Perhaps Peter will gain the power to mimic beyond just powers. 
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But haven’t all of Isaac’s paintings been pretty much literal representations up to this point? I mean, he paints a train wreck, Claire saves a guy from a train wreck. He paints an atomic blast demolishing the city, Hiro sees the explosion in the future. I see no reason that Isaac would resort to symbolism now.
I figure if he ends up fighting a dinosaur it doesn’t have to be symbolic if he really does have to fight a dinosaur - on a psychic plane - or something.
I’m thinking of the times in comic books when Professor X has been drawn into a psychic battle and his opponent can conjure all sorts of fantastic things on the astral/psychic plane and if you lose, you’re also dead in the real world.
It’s a total wild ass guess on my part though. I just can’t imagine how he’s going to end up on some sort of rocky outcrop, surrounded by flame and facing a dinosaur which is about to eat him.
There wasn’t any actual flame. The background went from brownish to orangey to brownish but no actual flames.