The Artifact has the unimaginable power which will be more and more powerful with the Artifact power upgrades. As for the famous weapon in ancient times, a cool appearance and tint are very essential. 
At Legion launch, each Artifact has five distinctive styles available (a sixth not implemented at launch). Four of these styles can be chosen/checked at the Artifact Forge in Class Order Hall. The other two Artifact Hidden Appearance styles need players to explore the unlock ways.
Six Artifact Appearance styles, each style comes in four tints. However, different specs have different appearance and tints. It is worth expecting for unlocking all these appearance and tints. Three specialized classes will open seventy-two different Artifacts.  
Of course, it is hard to acquire all these unlock styles which will take about three weeks to complete all Order Campaigns and two or three months to unlock all Artifact Traits.
As for Prestige PVP Level 13, you must have enough stamina to continue to farm and farm the Honor ranks to lvl50, then reset it and go on farming. 
There is no effect on farming in Dungeons and Raid achievement in a short time.
The different class has different specialized quests. Players must explore the hidden styles by themselves without any introductions. 
So, it is not easy to grasp all contents for PVP and PVE, each Artifact Appearance must unlock the first tint, then you can start the rest there tints.
Appearances, tints, and Artifact Traits don't matter when farming these items, only the models changed. If you want to gain a unique Artifact, you must insist on trying.