Larb: I think I drew them like that mainly because I was lazy and it sort of seemed to work (at the time). I certainly don't live in Iowa, just chose the simplest representation I could think of. (Lazy!)

vorropohaiah: Thanks. I actually like your mountains, they seem to work well with the style of your maps. They might be a bit too regular maybe?
You are right about the scale, this map was drawn on a A5 format, and since I'm using a rather thick pen it's sometimes hard to draw the little details. Oh, and I sort of like the undulating lines. I think it makes the land look less uniform.