The mapping is good, but try removing some trees and add things such as cliffs, and let's not forget some scenery like flowers, small rocks, bushes, and small trees.
The region map is great.
The overworlds should be changed to HGSS style to make it look better.
Also, I don't like the part about borrowing a pokemon to defeat the first gym leader, this actually in my sense ruins the attribute of accomplishing things yourself.
Finally, you don't need to do this, but shouldn't you list why the people are in your credits? (Even if you know why)