Imagination vs Skill are two way different things. You can pick up the skill no matter who you are. You can learn how to draw X style maps really well. You can learn to draw wonderful pencil sketches of the person sitting infront of you. It is a visual-mechanical skill that you can learn (anyone cam - just ask Professor Betty Edwards). Imagination is not something that can be taught though. You gotta look inside yourself, or outside to find that.