Hi, pouncer, and welcome to the Guild. I think your best resourse is our reference section, where you will see a lot of "maps by..." posts; each of these links to an admirable cartographer; basically we have already posted our favorite mappers in that manner, so my suggestion is to go look them over. It should only take a few minutes and I think will yield more examples than you can shake a stick at.
Who did you commission, if I might ask? Also, when the work is complete, make sure to let us see the fruits of his or her labor!
Thanks for posting, and good luck!