Hi Brendan -
I love your art too - very vibrant and colorful! And I think the most recent banner is perfect, it seems very representative of your art to me. Pretty!
It's a small thing, but I don't think anyone has mentioned it yet - the footer area of your site could use a little work, at the very bottom - it wraps around the page for a few lines. It would look neater if it were intentionally organized/wrapped - if that makes sense.
Such as (imagine these centered)
Gallery 1 | Gallery 2 | Gallery 3
Gallery 4 | Gallery 5
<blank line>
copyright/etc.
For the copyright sign - I think you are fine using the word, but you can get the sign using special "ascii codes" (look here for more codes:
HTML Codes - Table of ascii characters and symbols )
These give you the html code (and sometimes a name you can also use) that tell a web browser to display a special character.
To display a copyright symbol, you'd type "©" (without the quotation marks).
Congrats on getting the site up!