Welcome to the Guild, Such. The map's fine as a first effort - and thanks for diving right in, by the way. That's worth a smidgen of rep, just for your willingness to contribute.

There's a problem with your rivers - you'll want to go read Redrobes' excellent guide on How to get your rivers in the right place. Your main trouble is that rivers should join as they proceed, not diverge. The exception that proves the rule is a river delta, which is a very specific situation that you really have not depicted.

I bet the inland seas / lakes would look better if they matched the main sea - i.e. either leave out the 'wave lines' or rings, or else use them on all your coasts. They don't really add anything the way they are.

The map would benefit from a scale bar, unless it's so large a landmass that your projection messes with accurate distances.

Does "realm" here mean a certain kind of political unit? If so, why is the whole thing a realm, and then the western half is also a realm?

So are you going to annotate more locations and names as you go, in this campaign? That's a sensible approach, if your players could be expected to know this much about the whole of the landmass, and they can add more bits as they explore, or maybe as they get helpful input from NPCs.