Good day!

I've been working on a homebrew map for my D&D campaign for about 6 months now. Over time it's been fleshed out by myself and the players running about in it. So far I've used fantasynamegenerator's map creator, then GIMP, and now inkarnate. I really like inkarnate, even though the resolution isn't that great. Anyway, here's what I'm going for.

1. Celtic inhabitants and culture
2. Large continent with a variety of climates and landscapes
3. For those who know D&D, I want to lean heavily on a Feywild influence, which means lot of forests and wild natural areas.

Some troubles I'm running into are the top of the continent. I have the altitude much higher in that area with mountains and some tundras up there. I like the alpine tundra on the top left and am not entirely sure if it makes sense to have an area covered in snow nearby. Also, On the top right I would like it to be mostly barren and ridiculously cold and high altitude as well. Any tips would be greatly appreciated!

Map.jpg