I like it; it has a real 'in-world' feel to it, as if someone in the setting drew it. Your rivers look right for the most part, which seems to be one of the major pitfalls of newbie cartographers. (There is one area on the eastern continent where a river/lake system appears to join two oceans, which doesn't happen in the real world.)
I don't use CC3 and so can't offer much technical help, but as far as labeling, if you have access to GIMP, you may be able to do something like this:
It's pretty challenging to show black text on a black and white map. The little map above isn't the best solution, but it gives you some ideas, hopefully. The best option is to make it so no (or little) text overlaps any map features, but I know that's not always feasible.
Another program to consider is Inkscape, which is the open-source version of Adobe's Illustrator, and superior to that product from what I hear. I've never used either of those programs either , but from what I've seen here on the Guild, Inkscape can be used to create amazing text and labeling.