First sketch of the coastlines.

fill that with color!

here is where things star to get cool, the draw of the mountains and ground (highs and lows)

general markings for the vegetation and climate zones

Really adding the vegetation and snow... it looks ok, but could be better, doesn't it?

Yeah, it could. Some old papper texture and color correction make it look more like a map.

And there you have it, the final thing.