Very nice! I might suggest differentiating the sea from the land in some way, though I don't know if a shift in brightness or maybe some kind of texture change would be useful. You might also want to think (or have already sorted this out) about how your rivers flow. It seems they're coming from behind the mountains, rather than from within them, but it might simply be that you haven't mapped the tributaries that flow from the peaks.'

Fine work, though. And hey, welcome to the guild!

cheers,
Meshon