Good tut! I do have a question - I have been struggling to work how to get the same look to rivers that you find in any good atlas - they start thin, meander in very 'random' line pattern and join up to get wider until finally ending in a delta or an estuary. When I try, the rivers obviously come out looking overly smooth sided, and they do not start with near invisible thin streams that eventually coalesce to form a river. Any ideas please? (PS I have only just started using GIMP 2.8 - never realised until friends told me that there was anything better than Microsoft Paint!)