A small collection on here in an album would do wonders for self promotion. Once you have a few that have similar style and ability then people can judge if thats what sort of map they want. We have the map making requests forum here which people regularly ask for commissions. But I do urge people to put up a few of their own maps here so that people can see what you do. Otherwise take on the free requests and use them as a base to start with. But I think your quality is so good that you will not need it.

I particularly like the way you have the text hovering over the land. Thats an unusual touch. But all of it is really excellent.