Ashei's Sketch is given to Link by Ashei when he talks to her at the entrance to the path to Snowpeak. After showing it to Ralis, the prince will give Link the Coral Earring to help the hero catch a Reekfish. It is never shown what the sketch looks like, though it is later revealed that the monster on it is a picture of Yeto, as he traveled down from Snowpeak to find food to help his sick wife Yeta.
↑"This... Did you draw this? The beast... Hey! Isn't it holding a red fish? That's a reekfish!" — Zora (Twilight Princess)
↑"Apparently, the beast that lives somewhere on this mountain has been seen frequently in Zora's Domain. I was curious, so I came and waited...and as they'd said, a giant appeared! Yeah, it looked like this... [...] Apparently, this thing's been stealing red fish from the village. I want to investigate further...but I can't even see the path through this blizzard, yeah?" — Ashei (Twilight Princess)
↑"Hmm... The beast-man of the snowy mountain...perhaps? But more important is this red fish it is holding... It must be a reekfish. That is a rare specimen found only in the Zora village. It feeds on a valuable type of coral, and without that bait, even our best fishers cannot catch one. Look closely, Link... My earring is made of this coral. I would like to give it to you." — Prince Ralis (Twilight Princess)
↑"Uh! You! Wife...look bad, uh? Not healthy since mirror... So I make soup for her. Fish from Zora village are most nutritious!" — Yeto (Twilight Princess)