Looks cool.

If I was going to change something I'd vary the size of the islands. There are groups of two three and four and all the islands in the group are the same size. In real life it seems most island chains are varied sizes. Hawaii has islands in descending size pretty much from East to West, Indonesia has two big islands, two medium islands, and tons of smaller ones, you get the idea.

Also, continents 'should' look like they used to fit together Pangea style.
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Those two grabs from the Eastern Hemisphere (?) give me that sort of feeling, but the other half of the map feels like it is lacking that coherency.

By the way, asking for C&C early is a really good idea. Nice work so far. Please keep us updated.