the artwork is very good. you have some usless tiles right now, so if there are restirctions on numbers, you'll want to get rid of them. Also, if you are required to put both parts of a mirror on your set, i would make them unique instead of mirrored.
once it gets more full, i can edit to show how i might reduce tile count etc. if you like. right now i dont want to touch it because it's too incomplete for me to know what you need each tile to do for you.