Please keep in mind I know little about mapmaking and even less about Inkarnate. I like the colors, for me, it does bring to mine an irradiated hellscape.

The only constructive criticism I can offer is that there appears to be a texture under most of the land mass; it looks fairly cool on the orangey land and the dark land on the left, but a bit weird to also be under the blueish pars (swamps I think?), and maybe only the orangey land or the dark tan land but not both? (but still the very dark land on the left, so two areas in all); and the rives inside the swamps seems a bit off; sorry if that doesn't make sense. I like to plaster textures a lot too, and then I don't always clean it up, so that might be why I'm focusing on that aspect. Anyway, nice start, and like I mentioned it does give off a post apocalyptic vibe.