Excellent job, both of you. I couldn't have done it better even if I tried. I just have a few suggestions..:
1. Make the Biomes BIGGER! I can see other biomes from Normal distance... Making them bigger would be better and more... realistic.
2. Make Marsh to other biome transitions a bit smoother. (if possible).
Here's a picture to show what I'm talking about. The that yellowish Line is the different Biomes, the red is how blocky Marsh is... Not trying to troll or put your work down, but I'm just trying to help you guys Improve.
Hey guys, want a preview of 2 new biomes from my "add-on" coming soon?
1) I'm not even sure if it's possible to edit the size of biomes, but from what I've seen, it's not possible.
2) The Marsh is a "special" biome. See, I used a modified vine geneation (From jungles) for the sporadic grass "columns." It's not really possible to smooth it out, although if it really needed it, I could try doing an "edge" like Mushroom Islands/Mountains have. Not sure how much of a difference that'd make though.
Also, I see you're using my texture pack. Don't forget to use the MCPatcher with it! I can see the lily pads don't have the custom color.