The app is universal, so all the images are high quality enough so it won't blur or get pixeled up when you stretch them on the iPad, and they definitely look good on the iPhone. Each of the environments have moving objects, like smoke from the lamps, flying birds, shadow walking by the door, etc.
The Quality Index champions the best hidden object games on iPhone.
See if you can spot your favourite in among this superb selection. Nope, Where's Wally? isn't in the picture.
That isn't a red herring, by the way.