First, let me say welcome to the site!
Now then, you have a decent start, but I think you are trying to do too much too soon. I would back off a bit and first decide what you are expecting from the map. Is this a regional map, or an overland map? Next, I would stay away from adding the multicolored water and such until you have things looking good layout wise and then progress slowly using lots of layers to control how things come together.
Are you specifically trying for the same look as Pyrandon's map or looking to do your own thing?