Render layers added back in order after applying glow in compositor

Question

I've just had my first attempt at applying glow in the compositor using different render layers.

When I try and apply the layers back together however there is a drastic effect happening that I have no idea how to correct.

As you can see, the eyes are now popping out from behind the eye sockets.

I have been following Andrew Price's Introduction to Blender's Compositor tutorial but cannot seem to get the eyes to sit inside the sockets where they are supposed to be.

Answer 1

As it turns out, It seems looking back at this that the whole way I went about adding the glow to the eyes only was ineffective.

This question Highlights a much better solution to give the material a separate index pass and using ID Mask then apply the glow directly to the eyes.