On GamerPrinter's very cool map above.
I think intent really gets to the heart of this. Why did GP make this map? Was it simply functional? Or was there more? Honestly, looking at that, I would call that map (and certainly others he's done) art. But, I would say that the creation of that there was more to drawing out that map than just providing something for the game. It's gone beyond what the game needs or expects.
True, but I do the same for my home games, and I try to do the same with the prepared dialog, scene introductions, the pace aside from the actual encounters - its the way I game prep and play my own home sessions of D&D/PF. I want to evoke some immersion, so the way I run a game, and the maps I present are all part of the same experience.
I do the same for commercial work.
Edit: also in my design the intent is not to make it pretty, rather to allow the reader of the map to determine what the environment is like, what kind of flora exists, so as a GM he can more readily detail what the PCs see when asking about the scene of a given encounter. The text of the adventure states the distance between the bridge and the top of the water as 20'. With this known quantity, the GM can guess by the depth in the water that it might be 20' to the bottom of that depression in the river beneath the bridge. My intent on the map is to more readily describe what exists at the location - more in a scientific way (I stick with real geological land forms as part of the design).
It may seem 'artistic' but the intent was to provide as much information as possible within a simple map so the GM gets a better description as to what is going on. I really didn't do it for the sake of art, however, I cannot escape my understanding of artistic balance, color theory and all the elements of design in any concept I put pen to paper with. I want it to look 'real' within the confines of hand-work. If I draw something poorly, it could alter what the GM really sees.
Given that this is my intent, does that in any way take away the fact that the map is also a piece of art?
Most people wouldn't call a quick sketch on a Chessex map to be art. A fair amount of play in D&D has nothing to do with creating anything as well. I can't speak for anyone else, but, when I sit down to play D&D, I'm not thinking about anything beyond the game we're playing. There's no larger meaning or message. It's just a very complicated version of Cops and Robbers.
We have a whiteboard too. We tend to use it more than the maps, but I usually only make maps of major encounters or larger view maps such as towns and countryside. When its combat intensive, heavy rolling of dice, needing to know positions of all combatants on the table - a pretty map doesn't necessarily add anything.
I just mix that kind of D&D play, interspersed with more artistic presentation, but then, that's just me.
GP