I just made a test ad to see what it is about. When I tried to upload a *.png file as a picture, I got a PHP error. Maybe some protection code around that is required.
Also when I wrote the post I put a bunch of line breaks like you do with normal posts here, and the ad reflects none of them. I am not sure if we must add "\r\n" manually, or maybe add "<br>" or whatever is required, but the line spacing does not work for me.
Also I went to the Miscellaneous section by using the links on the left, once there, I didn't see a button for "New Ad". I only saw the new ad button on the classified's home page.
Other than that it looks really good.
EDIT: Ok, it requires "<br>" breaks for newlines.