Mockups and Wire-thumbs

Below you can see the Mockups I made (to iPad 3 screen size).

Also below you can see the wire-thumbs 

And lastly you can see a mockup of the main interface inside an iPad.

The problem I had with these pixel perfect mockups is that the sizing to an iPad 3 screen size was done after I made them (at a different size) so they look a little stretched. Next time I would use a different program.

Wireframes

Basic wireframe of the main menu, showing logo, New Game, Load, Trophies, and Quit buttons.

The loading screen with an image at top then the progress bar.

This demonstrates the Bag/inventory open.

This simply demonstrates the layout of the main interface.

This shows the 'are you sure you want to quit' dialog box.

Next time I would make more of the wireframes and maybe make them more detailed, however I was always conscious of the fact that a wireframe should be simple.

Similar Games on iOS

Looking into similar adventure games on iOS I have found there is be plenty.
See link below for examples:
http://www.adventuregamers.com/topgames/view/iphone_and_ipad

Looking into similar hidden object games on iOS have found them to be in abundance.
See link below for example:
http://www.squidoo.com/hidden-object-games-for-ipad

They are not only in great quantity but also have good reviews, especially those of the hidden object genre which are very popular way for people to past the time both on handheld devices and desktop computers.