Hello Everyone, I'm starting this thread because I start drawing a map, literally from scratch and would the feedback of you during the process.

Well ... Actually, it will not be a completely new but a new version of the map, say the next step of this:

First concept of this map, in December 2014
Click image for larger version.  Name: PytNP3N.jpg  Views: 59  Size: 248.9 KB  ID: 76087

In late January 2015, then did it:
Click image for larger version.  Name: dL3wwv5.jpg  Views: 58  Size: 1.71 MB  ID: 76088

I think it was in the month of April, using the Tutorial "Ascension atlas style," I got this result:
Click image for larger version.  Name: FXetWYw.jpg  Views: 69  Size: 3.84 MB  ID: 76089

Finally based on the tutorial "Eriond - A Tutorial for GIMP and Wilbur" by Arsheesh, this week, I did this:
Click image for larger version.  Name: HgFZLXy.jpg  Views: 80  Size: 470.5 KB  ID: 76090

Right, For this new version, the goal is to create a very realistic map and foremost, must be geologically and climatologically accurate. To this thought I'd start sketching the Plate tectonics but honestly do not know if this is the best place to start ... So please, tell how you think I should start this remake, considering I want an end result that has a landscape similar to the fourth image but does not have to be exact, especially the islands.