You are creating an image object, but you aren't displaying it on the screen. You need to either associate it with a Label widget, or embed it in a Canvas or Text widget. You can either create the Label image when you create the image object, or create the label ahead of time and change it when you create the image object.
For example:
skin1=PhotoImage(...)
the_label = Label(root, image=skin1)
-or-
the_label = Label(root)
...
skin1=PhotoImage(...)
the_label.configure(image=skin1)