How about getting started with high quality, ready-made realtime hair? Check out below the awesome low-poly hair assets by 3D artist Maria Zatorska. Most of them come with rendered textures, hair card based 3D models for Blender and Maya and the HairTG – Hair & Fur SBS procedural texture files.
If you own HairTG – Hair & Fur, you may edit the SBS with Substance Designer and generate your own procedural variations of the textures, including modification of shape, hair density, random variation, hair thickness, length, etc. You may also provide your own color sources including per-hair gradients, and generate the textures at resolutions up to 8K. Thanks to high level parameters in the main hair graph, it is possible to make certain modifications without any knowledge of HairTG – Hair & Fur.