You can add more than 24 by using the Insert Image button on the Item Description toolbar in the one-page lister.
Techncially, there is no limit using that method. However, I'd exercise good judgement in recognizing that it does cause delay in the listing page load with too many images.
I did a listing once with 100 collectible books. I had pictures of all showing front and back plus group pictures. The listing was a lot of work but I got triple the going price at that time. I received many emails from bidders thanking me for the pictures. I did use the subtitle to say "See numerous pictures".
I recommend sizing the pictures to the size you will be using before uploading to Auctiva so you don't have to resize after inserting the picture. Also use the full size editor.
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