Appearance mods are available for Fallout 4 that enable you to edit the looks of your character and other NPCs.
Core mods[]
Player[]
Edit your own looks any time during gameplay with Looks Mirror. The object can be constructed with your workshop.
With LooksMenu, you can make your own facial presets. Here's how. Then share your presets with the Fallout community at Nexusmods.com.
NPCs[]
There are two ways to create NPCs. One in game, and the other using Creation Kit.
In game[]
Edit the looks of other NPCs that you can spawn as followers through Npc Raid Spawner DangerZone. Relies on LooksMenu.
Use Amazing Follower Tweaks to target a follower and give it a new SPECIAL.
Creation Kit[]
You can really flesh out your NPC character using Bethesda's Creation Kit. You can copy any character profile or actor preset and tailor it to your liking. There is also a menu that allows facial reconstruction and hair changing. If you do not want to use vanilla hairstyles, make sure that you have a hairstyling mod selected as [active], in Creation Kit, so you can pick from the new styles. The character profile window will only show facial reconstruction changes, and NOT hairstyles or color changes. So you really need to know the name of the hairstyle and color you want before going in, because you won't see these changes, not until you get in game.