Hi-

Your post was in the moderation queue, I have approved it.

As a quick note, in the case of artistic works, such as maps, it is uncommon for the artist to surrender copyright unless a significant fee is offered. More typically, an artists retains copyright and provides a licence to the purchaser to use the work for a particular purpose or set of purposes, while agreeing to limit their use to display in a portfolio, etc, as you indicated in your post. In other words, by asking for copyright, your second point about you having rights for commercial use are irrelevant, as as the copyright holder you can do anything you want, including commercial use or even insisting the artist NOT use the map for any purpose...

Good luck on the commission - looks quite interesting, and I know any number of artists here work in that style.

-Rob A>