Looks awesome so far, I like the distinct black line too, though I think it'd be better if it ran all the way around the continent. To me, it doesn't come across as shading, because it's too dark and sharp, I think.
As usual, an excellent piece; the detail you gave the mountains is astounding. They feel very natural.
I noticed a bit of river overlapping on a lake in the south-central (leaning eastwards) section of the main landmass.
The relief design looks incredible. You mentioned you did it in a relatively short time (while chatting with someone) so I'm wondering what method produces such a relief quickly?