Spine would show the first attachment after you import the data, then you could choose which is visible, but only one attachment for a slot can be visible at any time. The thing is, you probably want to have the nose and eyes and eyebrow visible at the same time, so they should be in separate slots. You don't need to create a Photoshop group and use the [slot] tag unless you want multiple items in the same slot. If you just have a nose layer, the script will automatically create a slot called nose.
BTW, you don't have to put the tag at the beginning of the layer name. I like to put it at the end, eg guy [skin].
