Johanna in Hots is missing one of the 3 skins from the Overwatcht event (Peacekeeper Johanna). I can’t buy it and it is not shown to me.
Others also have problems with Johanna skins see Reddit
https://www.reddit.com/r/heroesofthestorm/comments/rdte0h/the_peacekeeper_johanna_base_tint_seems_to_be/