I suggest you do a crop of the picture, get all the extra wall, picture edges should be a bare minimum of the edging so that the quilt stands out. You did a good job of it, I'm sure of that, but I know you from this website.....others won't know that about you.
Take a shot of the quilting, front and back. Get a close up of the block, if you can. There are so many quilts made in other countries for way less monies that we are hampered here in the states.
The easier to see your quilt, the more bids, the more bids, the better auction.
Just my humble opinion as a quilter and a fabric buyer for myself. Chin up, you'll get there!
Hugs,
Sharon