I just want to add to the chorus here: your maps are amazing and beautiful! I hardly think you need to improve on order to clear some bar - only to continue improving as we all seek to do.

My main suggestion for you is to find other members of the Guild working in traditional media, and see if there are features of their maps that you like. Other than that, just keep experimenting with techniques! Lots of Guild members have a workshop thread where they post small studies and ideas, and solicit feedback.

On scripts, I think the reference to the Hobbit map is a great idea. Think about what information or artistic features you want the map to represent rather than making an arbitrary decision. There's no across-the-board rule.