It's a good map, Moskva - and a
great first map.
The land outlines are pleasant and interesting - one readily imagines where ocean commerce thrives, where corsairs might flourish, where I want to own the ferry franchise :-). The colors look nice, but you don't need quite so many.
Five will usually do, unless you have some discontinuous ownership - enclaves and exclaves.
The lower reaches of some of your rivers could stand a little more looping and wiggling, maybe. The lightest blue nation color is awfully close to your water color - not a fatal flaw, just mildly puzzling at first. Your terrain shading is so subtle I can't tell for sure, but the strings of islands at Casaiae may lack a reason for existing - the most obvious way to justify them would be to be continuations of an onshore set of mountain ranges. The font you're using for oceans is a bit of a mismatch - if whomever hand-lettered the nation names could get those labels nice and crisp, there would be little reason his larger ocean names would be irregular or blobby.
Nice work. Are you going further with it - cities, small countries' names, etc?