sentences:  Also due to the previous heroin use, Isaac was not able to clearly remember certain images after he painted them, as he stated in "Better Halves".It would seem that his precognitive abilities also augment his natural abilities as a painter, as Simone once complimented how much she appreciates the works he creates when he is high, and from the way Peter completed the unfinished portrait in "Hiros" when he first actively duplicated Isaac's power despite the latter having no innate talents whatsoever as a painter.It showed that Peter was painting an image he could partially see, so it could be suggested that Isaac's power allows one to "trace" an image from the future, rather than paint it from scratch
  
  Originally, Isaac's powers were triggered by the use of heroin, and he was unable to use his powers without it.