Um... no... the shadow was there. All of his paintings have been quite literal, all the scenes he has painted have come true... they have not usually been what we thought they were, but they were real, true an quite literal.
The only thing not coming to pass yet is Uluru, and that doesn't mean it isn't literal, only that it hasn't happened yet... the museum dinosaur was something totally different.
And since Isaac's paintings always literally come true, then it's pretty clear that he's going to die... and how!
Peter's dreams, on the contrary, are extremely illeteral. In his dream simone dies because of him as he explodes, in real life, Simone dies because of him exploding emotionally. No one else dies in the dream explosion... to say nothing of the uniforms being worn...