>>101876694
I generally use the special brushes just for the inside topology, not for outlines of islands/borders. Those I draw in by hand so I have more control. It's pretty simple once you get used to it, but it doesn't hurt to spend a bit just zooming in on different spots on google earth to get a feel for how water carves up the land or deposits sediments.
I noted on the pic a few things that I stay away from when drawing in islands
>purple
Isthmus. Don't really occur that often, so I use them very sparingly if at all
>Green
Repeating patterns. Idk I just think they look ugly, tho you can at times explain them with things like impact craters or some such
>red
too wild of a coast. Water does a pretty good job of eroding rock away, and while on smaller scales you can still go a bit more experimental with it, on larger scales I usually tend to stick to making the shores more mild if that makes sense

Again, if you know what kind of islands you'd want you can find plenty of refs on the maps of this floating rock we suffer on, and it's also just real fucking interesting, did you know there was a mountain that lost an entire side to a slide up in Greenland a few years back, caused a 200m wave, and we didn't even know where exactly it happened for a year? https://www.youtube.com/shorts/IDxvcxzuw0o