I think door 7 is the portal to FTL since it is an ornate wooden door with large trees carved on it, which reminds me of the Enchanted Forest. Door 8 is aquamarine in color and could represent Atlantica, the underwater realm of Ariel. Door 12 looks Oriental as to possibly be Mulan’s realm. I think door 15 looks like it could be a nod to Tron, which was was written by the producers of OUAT. I also think door 16 is so ordinary as to represent Earth, the “real world”.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy