Welcome to the Guild, Zen Clark.
I'm not a gimp user, but it looks a little pixellated. Otherwise, it's too early to say. It may be helpful if you could explain what the different coloured areas are supposed to represent (borders? Desert? Forest?) and the scale you're working to.
You may want to check out Jurgen Hubert's excellent tutorials (in the tutorial section) on using Gimp for mapping for some ideas.