Have Genesis 2 selected in your scene, and across the top of your preview window do you see a materials tab? Click on the materials tab. Once inside the material room you can have basic material settings showing or the advance. You want to look in advance. Next to the advance tab is a dropdown arrow that lets you select which material zone you are looking for. Choose nails. It should bring up all the images that are being used on the nails. Look and see if there is a black & white image plugged into one of the material nodes.

In my quick screen shot that (excuse the sloppiness of it) the red circle shows where to click for the materials room, and the three lines leading out from it show what you monkey with once you are in the materials room. The object drop down box you use if you didn't select Genesis 2 in the scene. You can use that to find her in the list of items that is in the scene.

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