Looks like Serpent Isle to me! Nice work. Is this a Map0.mul sized map?
Some of the islands have sharp edges to them, I would try to break them up a little so that they look more natural.
The star shaped isle in the lower right looks kind of out of place in the map. Cool idea, but maybe not the right map for it.
I know the little ice pieces are supposed to represent ice flows, which worked great in Ultima 7 Part 2 but might not work so great in UO, especially for those trying to navigate ships through there. Plus they will look more like little isles than ice flows.
Otherwise looks like a great translation of Serpent Isle! I did a similar map (only my version was about the size of Hythloth Isle) so I recognized the design right away.
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