I am not sure what Zoomed in look means. The map that you showed is a world map that is either just one continent or perhaps just one part of a larger map.

First of all there is a huge section here on tutorials. Perhaps sift through them first to see if someone has tutorials that offer what you like.

Atlas style maps are interesting there are a few tutorials here for them.

There are many styles, hand drawn, water color, ones that use CGI textures, etc.

Here is a video tutorial for trees and mountains
https://www.youtube.com/watch?v=W-YiOAr_Iok

Here is another series of video tutorials but of a city map, the same techniques can be used for world maps though.
https://www.youtube.com/watch?v=KO4XZfaSAoA

Good luck and just try different things that you like.
Ascension's tutorial is a good start.
http://www.cartographersguild.com/showthread.php?t=2229

I use his technique for creating the basic shape and then I use other techniques for coloring, shading, mountains and trees.