Awesome. Here's my critique.
First of all, I love the second island, it is a good addition to the age. Once the village is there it will look even awesomer. In terms of trees, it seems a little less like a forest because there are less trees and they are all the same size. Although, that could be because that's the island that they got their wood from, so a lot of the trees were cut down (in that case we'll have to add some stumps). Perhaps if we just add a few different sized/shaped trees there it will look better in that respect.
Second of all, as you've mentioned, the texturing isn't quite right. The textures themselves look perfect (especially the sand one on island 2), however they aren't detailed enough and that can take away a lot of realism. On that note, why is the texturing on island one different? I thought it was perfect before. Was there some reason that had to be done to get things to work?
The water is almost perfect, the reflection is pretty good.
Love the different tree type, it's good to have variety. On that note, I think adding all different kinds of vegetation throughout the age will make it look much more realistic.
The sky looks cool that it moves, but the stretched spots kind of put a damper on it's awesomeness (and I'm sure we can fix that pretty easily). Also, the ripples seem a bit too white.
Other than that it's an awesome addition, of course it still needs a lot of work, but that will come in time. One last question though, why is there a third glass hut on the second island?