I would recommend sculpting a world from scratch if you have enough time. It's much less of a One Day Worldbuilder that way, but you have much more control over where the land and mountains are. The example world Helena is a hand sculpted world done that way. The other two examples started with a synthetic world, and if you look at the initial file you can see that it strongly influenced my sculpting.

However, if you find a synthetic world that matches your needs pretty well there is no reason to start from scratch when you can use that one. A word of warning here, though, which I should probably have put in the tutorial - continental shelves make things awkward, so if you use a synthetic world chose one that has been generated without continental shelves.

General advice: the process is a whole lot easier if you try to restrict yourself to using only the prescale offset brushes as described in The One Day Worldbuilder. Using other brushes tends to do rather a lot more damage to the underlying fractal.

Its better and safer to make a subfolder in your Documents folder for all your mapping projects and keep them in there. Easier to find as well ;)

I often get asked what each of the Cartographer's Annual contains, or which of them has a good style for a particular job, so I thought I would collect them all here with linked images to each issue as a quick reference guide.

2007 (linked images)

2008 (linked images)

2009 (linked images)

2010 (linked images)

2011 (linked images)

2013 (linked images)

2014 (linked images)

2015 (linked images)

2016 (linked images)

2017 (linked images)

2018 (linked images)

2019 (linked images)

2020 (linked images)

2022 (linked images)

2023 (linked images)

2024 (linked images)

A great start, but I see something that is catching my eye far more than the repeating textures. Does it take 3 passes to render?

If it does, and you are now asking your screen how the heck I knew that, I'm looking at the horizontal bands across your map.
This can happen if you have really wide glows, shadows or edge fades in operation (which by the look of things you have), and it is caused by the width of each pass.  If the object casting the shadow, or the edge of the polygon with the edge fade on it isn't visible in the current pass width, CC3 can't see the sheet effect, even though the result of it falls within the pass.

You can check the pass width by typing EXPORTSETMPPP on your keyboard and hitting return.  Check the number that shows in the command line.  Unless you have changed it before the default value is 4000000 (4 million).  You can increase it by typing 40000000 (40 million) and hitting enter.  Try rendering the map again with the same settings as before.  Hopefully by increasing the width of the pass this way you will get the whole map in one pass and those horizontal lines will vanish.

@Shessar I just saw Ralf use an RGB Matrix Process sheet effect on the cliffs to turn them bright green on the live stream. Maybe that might help instead of having to deal with the issues that normally arise as a result of making symbols transparent?

(not turning them bright green, but using one to make them paler and more in line with Mike's colour palette)