Yep, resize the logo, and go a little lighter on the colors of your bio text. Me personally, I find the stark black background jarring, but I know there are many who like it just fine.
Abbie gave you a bunch of good reading to start with, also if you search the forums for "marketing" you'll get a zillion results. Remember this place is a platform for you to sell your work, you have to get out there and do the marketing yourself. Send buyers to your site.
Welcome, and best of luck with your work, looking good so far!