So after using RobA's tutorial to make a base map, I found that making hand drawn mountains wasn't something I really wanted to do. So instead, I experimented with making another solid noise map ontop of the pre-made island continents and then coloring them down from brightest to darkest by hand using the select tool. I also really wanted to avoid hand drawn rivers because I spent 3 hours and didn't like anything I drew.

I'm unsure of how it looks. I still have the XCF with all the original data so any tips and pointers could be made possible. I'd also like to thank RobA for the great tutorial and I'm sorry for ignoring half of it.
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