I've been making fantasy maps for a really long time; when I first played The Legend of Zelda to the time in 6th grade when the teacher read us The Hobbit and asked us to write our own fantasy story complete with a map. (I wish I could go back and thank her for that crash course in storytelling and worldbuilding--ask me about the Isle of the White Dweebs or Carcs, fuzzy winged wolves that looked suspiciously like my dog at the time.)
Even though I've been doing this for a long time, I am still in awe of maps and the people who create them. I don't accept freelance work anymore, due to wanting more time to spend with my family and on my own creative projects, but here are some of my favorite mapmakers and places on the internet, and though I only mention these few, there are so many more.
My absolute favorite map site on the internet; plenty of reference, and the host there is extremely kind: