I think what SkinvB meant is that this specific forum is for people to post *free* styles that are available for download. If yours will be for sale, I'd guess the appropriate forum to use would be "Modified Boards." I put one of my styles up for review and criticism there and the mods did not have a problem with it.
Happy to give some feedback if you want...
All of the styles look good, but not too different from the original. Not sure they are different enough to inspire people to purchase. While some of the buttons have changed, many of the icons (thread, thread_hot, thread_hot_new, etc) are the same as default. I think that people will not be too interested in paying for a style unless it includes all custom graphics.
I would also suggest that you improve your font selection. When going for a custom look, you should find fonts other than Arial or plain sans-serif to use in the header graphics. Here is my favorite font site:
http://www.larabiefonts.com
Good luck!