It doesn't meet all your requirements, but I've used BiddingPond
for a dozen or so successful transactions (most of them me selling something). It was much more popular when it first came out, but since then has had times of not having much support or usage. I get the impression that it's just something that one person maintains in his spare time, but it recently had a bit of an update and I can log into my account again at least, which seems promising. If the owner keeps on working on it it could grow quite a bit again.
It's very much like eBay used to be when it started, where it just connects you with the email address of the other party and you're expected to arrange for payment/escrow/shipping yourselves. They claim to be working on an escrow service "soon", however. You can definitely list items with pictures and descriptions, and it supports English. I'm not aware of how good its international support is, and it may not have much of an audience that reads Chinese, but I don't know.
Hope this helps somewhat.