First of all, welcome to the Guild, and have a bit of rep for posting a map on your first post.
As far as your map goes, I really like the landmass shape; very cool. I'm at work right now and don't have time to give you a really in-depth critique, but something that strikes me immediately is the layout of those lakes and rivers on the main continent. The way they're laid out, it feels as if there should be a mountain chain (or at least higher ground - a big plateau maybe?) right in the middle running west-east, for feeder rivers for all those northern lakes to flow from, as well as more inlet rivers for that big southern river/lake chain.