Yeung Hong isn't a very popular character among Jin Yong fans...not necessarily because he was a villain, but because he wasn't a very effective villain. His martial arts skills were underwhelming, and his capacity to scheme and plot were not that much better. The only thing Yeung Hong had going for him as a villain was his utter depravity, but even then, other Jin Yong villains did that better as well.
If it were up to you, how would you upgrade Yeung Hong as a villain?