well, you'll have to upload them to a different site, and then link to them using the url directly to the item, OR, you could make a page with pictures of all your items, but, you won't be able to do so directly because the no html is allowed, and there're no fusetalk image tags enabled for this forum.
It makes sense though. Imagine all the bandwidth wasted on large graphics for 50,000 users. Worse yet, imagine all the pictures that NO ONE wants to see that some would post (some have even linked to pictures that are horrible....).
With 50k users, image tags just aren't realistic - it would be a mess trying to monitor them all.