The Army Painter - Barbarian Flesh is great to use for visible skin on miniatures, by using this you save a lot of time. It works great with Celts, Hordes Vikings and other Barbarians in general. Especially the painters of the Ogre Kingdoms will have a lot of fun with this, but also the Beastmen and the Skaven can benefit from this. It makes the miniatures more realistic and ensures that you have large regiments ready in no time!
Tip! All three Quickshades (Softtone, Strongtone and Darktone) can work well with this primer, it depends on how you want to have the shadows.