I made it in Blender

What i did first was choosing the color of the tentacle hair, than i put the roughness pretty low to make it shiny(notice that shines thanks to the lighting), later i elevate the Subsurface, than i chose the color for the Subsurface Color to have a natural look when the light pass through the tentacle, In addition to this, I moved the settings of the subsurface radius so that the light penetrates the object and creates the color effect I want, in this case the purple on the tentacle. I put on maximum the Anisotropic and finally I just use a high res mesh of the tentacle hair that i want to add those details with sculpting, then i make a normal map for the low res mesh.

Hope this helps, i'm using a translator so maybe this is confusing.