You can't magnify the first photo.
The actual Nessie photo is the THIRD photo you take at Loch Ness. On your first visit there, you get the camera and matches, and a rowboat ticket from the dart game at the Pub. But the photo you show to Mews is just truck tires, and a shadowy Nessie in the background. On your second visit, you win a submarine ticket, and after showing the submarine photo at the pub, you will eventually get a pennywhistle to summon Nessie.
After you get the camera, go to the pub.Play a game of darts to win a rowboat ticket.Use your rowboat ticket to go out into the water.Snap a picture of the humps in the water.
Dive to the bottom and go left, and there is a colorful Nessie head. Take the photo back to the pub.
It is one of the locations on the helicopter GPS system on Cryptids Island. Once you are rescued by Mews, review the videos and you can go in search of the four cryptids.
In the submarine, dive to the bottom and a little to the left. There is a fake-looking Nessie you can photograph. Go back and show it at the pub.
Get the grappling hook and go back downstairs.
Go downstairs and to the right, to the Cryptids Museum in the mansion. Look at the 5 videos of cryptids, and Mews will return to give you some instructions.
When you come downstairs in the mansion, go to the right and enter the museum. You are supposed to watch all five cryptids videos (or just open and close them), and then he'll come in to give you some instructions.
go to the new guide on the rocks and he will take you
look at the door in the bathroom :)
You go to the very left, on the rocks by the lighthouse.
He is in the Pacific Northwest, where he lives in a cave. Once you have confirmed the other 3 cryptids, you can go there and follow him in the helicopter.
go to mew's mansion to continue your journey.