Ahhh, I would say this is the reason! Next map i'll try maybe a more scattered brush for my mountains and not so strait. Thanks for the enlightening! Much appreciated. For the record the map is meant to be a country rather than a small island :I (New Zealand size I guess haha). Well for a first time attempt I'm fairly happy and i'll only learn from my mistakes :I
I would say that the biggest readon that it looks odd is that your mountains are single, straight strokes. Real mountains have a more dendritic pattern that has little segments that don't align, but are end-to-end.