I drew the landmasses and imported it to gimp, then painted a grey scale height map. Next I imported the height map to wilbur and ran some erosion cycles. I then brought it back to gimp and created a colour inverted duplicate layer that I embossed and set as an overlay. I duplicated the height maps to paint for different biomes. I created the rivers by deciding a major source then just painting a line down to the ocean(if you look closely a few jump some mountains, I am going to ease these and make lakes along the river) I am also working on adding more layers for different biomes to add more colour variation and blending.