Great Work.

I'm new to the guild too. The landmasses are really good; I am actually particularly fond of the shapes you have come up with. The northern portion of the western continents look realistic, especially the north western continents.
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The only thing are the climates are bugging me a bit. That island to the north east has tropical zone at the same latitude as the temperate and ice biomes. I'm not sure if that's just an error or not, and to me it seems like there aren't enough arid regions since it's supposed to be like Earth since it's covered by about 1/3 (which I know it's not supposed to be Earth, but if it's more like our planet.).

Otherwise it's a great start, and I know how crummy Paint is since I've tried doing maps on it I use it sometimes for very rough outlines for ideas I get in my head.