Drop shadows are dangerous to use with mountains - they make the mountains look like they're floating over the landscape rather than rising out of it. I don't know the nintendo rpgs you're referring to, but did the mountains look long and thin with no branches on them? (I'm assuming yes). If you're going to make them long and thin, I'd be tempted to make them more maze like, rather than running in parallel. Maybe, instead of the drop shadow, if you feather the mountain base it might look more a part of the grass where the two meet? Nice look to the grass though - how did you do that?