I agree with some of the comments about the centered text and colors, but that is something you will fool around with and refine over time as all of us have.
Overall your hard work shows, your shop looks like it is run by a serious and professional seller.
Most important thing to me is to unclutter as much as possible. Make sure there is not so much text that people overlook the important stuff, that is your terms of service. Again, that all gets refined with experience.
One question, about "the bidding starts at 80-90% and buy it now at 70%" did you me of retail or off retail? That is two different things. Maybe I read it wrong, but you might check that.