There is also a picture icon in the HTML editor for your description you can use to insert more photos. Be warned though that it inserts them at full size. Thus if you upload a huge 1024x768 photo that's what we'll put if you use that.
You can get around that by resizing those photos to 400x300 before uploading or some size in between. You can also shrink them using HTML after inserting them, but the images don't get physically smaller so they take just as long to download as the image you uploaded to us.
Or as the poster above suggested you could put 2 items in one photo. Our click to supersize feature should give your buyers enough resolution to see details when they supersize the image.