The VG Resource

I've ripped sprites from a game that uses a fourth channel as a mask for color customization. When converted to PNG, the fourth channel is used as opacity: 
[attachment=14498]
With the opacity corrected and the mask isolated:
[attachment=14497][attachment=14496]

How should I submit them to the Spriter's Resource?

1. Two separate sheets, like SchoolGirl & SchoolGirl_Mask
   
2. One sheet with the mask sheet appended below / beside the other?
   
3. A zip with both sheets
   

Thank you for your feedback

I'd say 2 or 3. In the end, go with what you prefer and see what the staff thinks once it gets reviewed.