Hi mrssweet one way is to look at the HTML of your live listing and substitute the URL (address) of the current image for the new one. This is possible until you have bids or less than 12 hours to run.
You can get the URL of the new one once uploaded to Auctiva from your saved listings folder.
I did a lot of experimentation to get decent results with my little automatic camera but that is the joy of digital photography none of the expensive and long turn arounds you get with roll film.
Also you can edit the pictures to correct moderate exposure errors with quite cheap photo software.
Hi rosalie a 3 meg camera is more than adequate resolution for even a supersize image and that is all I use. Admittedly a camera with manual exposure and shutter speed would be preferable but a bit of trail and error works wonders.
What size of items are you taking pictures of because you may not be getting crisp pictures because you are too close.
Alternatively or as well as maybe the light is so low that the camera selects a very low speed and what you get is a blurr through camera shake.