I want to thank everyone for all the tips and feedback. I made some changes on the Fjords, hopefully making them a little more realistic. I also changed around the tectonics and consequently, the continents and islands, nothing major.
Overall changes were minor, I liked how the world looks so far. I also realized I don't want to bother with realism too much. The world is going to be high fantasy, in a late Renaissance period and this Atlas is going to be an in-world map, so inaccuracies can be excused. I'm basically going a semi-realistic, semi-stylized map.
This is how it's looking so far. Might make a few small changes to the landmasses, I'm still not sure on the middle of the westernmost continent.
Also the world is called Arcaeli now, hopefully meaning "Ark of Heaven" without butchering the Latin language (Blame Google translate).
Arcaelum 2.jpg