Looks good to me, congrats on your first map.

Two things:

1) The outlines to the landmass are a bit overdone. I count ten of these while I think three would have been enough, five tops. I mean, check out that tiny island in the south, it appears way bigger than it is.
2) The background color is nice but you could perhaps add a little bit of texture to it. Maybe some subtle clouds. But you don't have to, it's just a personal preference of mine to have a background that isn't uniform.