This discussion may contain spoilers!
When Bigby noticed the picture and took a good look at it, he saw Crane touching Snow or the troll (Lily that was glamoured - please tell me whether it was Snow White or Lily because I sort of misunderstood).
What do you think? How is Crane involved? What was he doing? Why did he meet her?
Excuse me if the answers were already said in the episode because I played it while half-asleep lol.