i had a big nice long post typed up but then i lost it when i was trying to enter a special character with the numpad
gog damn num lock i should see if you're on next time
i'll see if i can summarize it (it won't be as good because i don't want to take forever)
damn this pisses me off
Ok so you really need more stuff. This world doesn't really have a sense of "largeness" that it should. For a made-up-world example, see
this wonderful (unofficial) map of Abier-Toril (scroll down and click on the "Abier-Toril.jpg" under the Maps and Locations heading, it won't let me link the image). There are just a lot more continents, and it certainly seems "big".
You need to say whether the world was explicitly created by gods (in which case anything goes really) or whether it is more like our world, in which case you should look at
plate tectonics to get an idea of how your landmasses interact with one-another.
I was going to say something about the islands in the middle but I don't really care anymore besides saying that
they form a pentagram.
You should define an equator, and base climates on the distance from it.
You forgot about units on your scale in the legend.
I'm assuming your world is spherical, so keep that in mind when defining the climates.
I think that's it for critiques.
On the other hand I really like the shape of the large landmass.