That's funny. I immediately thought of
#37 when you suggested that #9 was too simple. Simple is actually often sought after in a logo. I think the idea is that it is easier to remember and describe something simple than something complex. I'm not arguing though, just sharing a viewpoint.
To answer your question, sure I could make it more complex. I could add more shapes, more color, more texture, etc. Is there any particular direction of complexity you think your friends would find appealing?