Shoshon's is amazing in its simplicity yet still being interesting. Ideal for a first dungeon and gets my vote.
Matthew was my runner up, it looks great and I can't really say "I would change X, Y and Z" about it; I just happened to like Shoshon's more. Stop reading this and go work on your quest.
Joel's isn't bad either, but the lack of distinct landmarks except towards the middle section seems like the edges of the map would feel a little samey. Great use of elevation though.
Demonlink, basically same as Joel. Landmarks or other major points of interest will help the map feel more memorable. Or failing that, stuff it full of rupees/heart pieces/whatever other goody you can hide.
Anthus, it looks good and really functional. I'd actually be the more interested in seeing this in a finished quest, but the Zelda 1-esque vibrant green walls feel a bit.... weird when put with other elements like the trees and similarly colored floors. I'd suggest washing the color out of the walls a little bit to help the green room objects be more visually captivating. Of course, I realize this is a default palette of that tileset so my criticism isn't really with you but the tileset; I'm just not a fan of the wall color.
Yloh, same deal with Anthus. The green in the lower section is extremely bright. Maybe it looks better ingame, but the map(especially contrasting the more reserved green on the top layer) isn't doing it any favors. Interesting looking gameplay though!