I really like the MTX you have in the store at launch but something that could be an improvement I think would be to make the 1h mace and 2h mace skins the ability to be applied to any melee weapon you have equipped.
I think this would be nice in general to be able to apply MTX from weapon type (1h melee, 2h melee, wand, etc) since it would give the skins more value and when you are leveling through the campaign you can actually run with the nice MTX that you bought.