I know that both me and Ran have made GRRM aware of the map's existence, and it's been added to the gallery at Westeros.org (the more-or-less official ASoIaF website). However, there is an immense timelag between these things happening and GRRM responding; he's still answering fan emails from about a year ago

Tear, are you planning to do any further such maps, maybe one of the Slaver's Bay map from ASoS or the Free Cities one from ADWD (when it comes out)? I'm quite interested to see what you come up with next!