Hey, great work, looks like a great start.

For some reason the rivers seem to be at a higher level than the surrounding land, it may be my eyes but they don't seem to be 'sunken' into the land at all, maybe some sort of shading might help them blend in?? I think some of them look like they are running along the top of a line of hills rather than seeking lower ground.

Also, the snowy mountains don't seem to rise up particularly from the land, looking instead like fairly flat rough texture.

It may all just be my eyes this morning though!

Your work on the islands looks stunning, they really rise up from the sea. Your work on the coastline is good attention to detail too with all the little crinkles that are indicative of smaller rivers hitting the sea. Nice.