Of course! It's yours to do whatever you want with :) I can provide you the Paint.NET file with everything in layers, which might be useful for the trees, being half covered in route xD
By the way, I tried to stick to the original geography as much as I could, so the three islands are the two islands that were on-map, with the bigger one cut in half. In case you were wondering :P
Anyway, glad you like it!