There's also a second 'quicker' way to do simple morphing with less farting about with layers...
Open the image in Gimp, and then Duplicate the default/background layer. With the second layer, add an Alpha/Transparency channel to it.
Then IWarp the second layer, not worrying too much if other parts of the image get distorted.. In this case, the butt of the kitsune girl got squashed a bit-- in other images, things like straight line features in the background become curved, making it obvious something was distorted.
Next, the unwanted distorted areas in the second layer then get erased.
Flatten the image, post it to the Internets, and then bask in the mouthbreather comments that you live for! Yay.