Yes, avoid Da Yang and Litta at all costs. I've posted here in that regard before, so it would be wise, as in all situations to check the archives.
Litta is the most dishonest person I've met in China. Be very careful; you may be taken in by her well affected "sweetness" on the telephone and in emails. However, if you choose to accept the position, you will find that "the truth is in the pudding."
Jingdezhen itself is a waste of time. Yeah, it has some historical signifigance in terms of ceramics but that's about it, and if you'd like an enjoyable "China experience," there are many, many other places that are far more worth your time and effort.
Da Yang is not legally licensed to employ foreigners. Jingdezhen is a bust. Litta is dishonest and too clever for her own good. Need I say more?