That looks good dominic, great start on your mapping. Love the names too, although Junk island made me instantly think of is that is where all the junk food restaurants recide
As Aenigma says the borders to the neighbouring country are very smooth, but if they have been decided by the countries by drawing on a map - they are allright, if not, the would probably follow natural borders more - mountains, rivers and such, and therefor be more ragged.
Concerning the color, if you plan for it to be in the books, black and white might be a good way to go - then again, unless you've allready sold the book, you'll have plenty of time to change it to black and white - and perhaps by then your mapping skills have increases so much you'll want to do a whole different style - who knows... but good work and have some rep for your first upload