Wow, it's such a great idea to display deviantART's galleries as a transit map. I would never have thought of this, but now that I see it, it makes total sense. The galleries and sub galleries of dA really are like different stations on a railway. The further you go away from the deviantART "main station" the more detailed the galleries get.
It's fascinating to see how far spread you map is, I think mine would consist of only one or two lines.
One tiny little thing that I think could be improved is the part of the map that isn't the galleries. You named the big body of water "Sea of Scraps" and I think it'd be really cool to have other things like that on your map. What's that forest/park in the northwest? Or the lake in the southeast? Does the river have a name?
Anyway, it's a genius idea and realized very proficiently. The DD was totally deserved!