We do have a few mountain tutorials for PS in the Tutorial section further down on the main page. You might want to look at Ascension's Atlas style tut, because that is the closest to what your map seems to look like to me.
At a quick glance I don't think there are too many problems with the land masses. Looks to me that they are once again in the process of breaking apart even more than they did initially. A young and active planet maybe?
Forgot to say a few things...
1 - Welcome to the Guild, The Mappiest Place on the Web
2 - Have some Rep for posting a map in your First Post