Her previously released skin is still her best one and even then Riot barely did anything with it other than add a failed attempt of a face in her ultimate. This train wreck you call Jade Fang Cassiopeia should really be looked into.
The only thing going for this skin is her recall animation and some may say her E but even that looks lack luster. The rest is just trash compared to the other released skins. The particles need to be changed so they can be more interesting or worth the same as the rest of the newly released skins and their particle / sound / animation changes. (Including Varus' skin) Not some half assed job at recoloring her skills in the last second of the PBE patch.
The model should also be looked into. Like I mean really. She is not a mountain goat. Come on Riot. At least put the snakes somewhere else or give her a better headpiece or something! Her tail is just one block of green, it could have at least had a different pattern or shading or remove some of those red armor pads to make it not look like a hot mess of shoddy colors.
I might add more to this later if it even gets any views since I know other people think this skin is terrible.
Riot you screwed me over with Mistletoe LeBlanc, don't do it to me again with Cass' second new release skin.
Knowing that people are agreeing with me and have some input. I've gotten responses not only from this thread but other threads and also people discussing it.
Passive: Light jade color change? Small jade snakes rotating around her? (I forget what thread I got this from )
Q: Ghostly/illusion effect of a Bat Gua. (Suggested by Zeninth)
W: Mix of green and purple and create a snake design on the ground after the particles settle. (Also suggested by Zeninth)
E: Jade fangs or jade snakes that shatter on impact. Shoots jade statues that shatter on impact. (Zeninth again)
R: Turns everyone into jade instead of stone. Needs better coloring / effects to go with it. (http://na.leagueoflegends.com/board/....php?t=3011329)
Also, I forgot who suggested it but when she dies she should turn into Jade instead of stone.
--- A RIOT POST REGARDING THE SKIN! ---
re: jade — while there might still be another minor tweak or two in addition to the changes made to her ult, the headdress is very likely to stay as is.
tl;dr: Cass' skin is terrible and needs to be looked into and changed.