The realistic eyelashes model contains multiple eyelashes hairs, generated around the guide.

The hairs grow outwards from the base mesh surface. For that to work as expected, the normals of the base mesh have to be in the outward facing direction. If they are inverted, the hairs will grow towards the inside of the base mesh.

Hairs Count - The amount of hairs in the eyelashes

Density Seed - Variations in the density distribution

Density Levels - Amount of control points for the eyelashes density

Density Start - Density at the first control point

Density 1/3 - Density at the second control point

Density Mid - Density at the middle control point

Density 2/3 - Density at the fourth control point

Density End - Density at the last control point

Density 1/3 Point - The position of the second control point

Density Midpoint - The position of the middle control point

Density 2/3 Point - The position of the fourth control point 

Spread Seed - Variations in the hairs spread

Spread Levels - Amount of control points for the eyelashes density

Spread Start - Density at the first control point

Spread 1/3 - Density at the second control point

Spread Mid - Density at the middle control point

Spread 2/3 - Density at the fourth control point

Spread End - Density at the last control point

Spread 1/3 Point - The position of the second control point

Spread Midpoint - The position of the middle control point

Spread 2/3 Point - The position of the fourth control point 

Randomize Length - Randomize the length of the hairs

Length Seed - Variations in the hairs length

Length Levels - Amount of control points for the eyelashes length

Length Start - Length at the first control point

Length 1/3 - Length at the second control point

Length Mid - Length at the middle control point

Length 2/3 - Length at the fourth control point

Length End - Length at the last control point

Length 1/3 Point - The position of the second control point

Length Midpoint - The position of the middle control point

Length 2/3 Point - The position of the fourth control point 

Randomize Tilt - Randomize the tilt of the hairs

Tilt Seed - Variations for the hairs tilt

Tilt Levels - Amount of control points for the eyelashes tilt

Tilt Start - Tilt at the first control point

Tilt 1/3 - Tilt at the second control point

Tilt Mid - Tilt at the middle control point

Tilt 2/3 - Tilt at the fourth control point

Tilt End - Tilt at the last control point

Tilt 1/3 Point - The position of the second control point

Tilt Midpoint - The position of the middle control point

Tilt 2/3 Point - The position of the fourth control point 

Randomize Rotate - Randomize the hairs rotation

Rotate Seed - Variations for the hairs rotation

Rotate Levels - Amount of control points for the eyelashes rotation

Rotate Start - Rotation at the first control point

Rotate 1/3 - Rotation at the second control point

Rotate Mid - Rotation at the middle control point

Rotate 2/3 - Rotation at the fourth control point

Rotate End - Rotation at the last control point

Rotate 1/3 Point - The position of the second control point

Rotate Midpoint - The position of the middle control point

Rotate 2/3 Point - The position of the fourth control point 

Randomize Bend - Randomize the hairs bend

Bend Seed - Variations for the hairs bend

Bend Levels - Amount of control points for the eyelashes bend

Bend Start - Bend at the first control point

Bend 1/3 - Bend at the second control point

Bend Mid - Bend at the middle control point

Bend 2/3 - Bend at the fourth control point

Bend End - Bend at the last control point

Bend 1/3 Point - The position of the second control point

Bend Midpoint - The position of the middle control point

Bend 2/3 Point - The position of the fourth control point 

Bulge - Inflate the thickness of the hairs tips

Round - Create round hair tips, as opposed to pointy

Scale with Length - Scale the hairs thickness, based on their length. Shorter hairs will become tinner.

Randomize Thickness - Randomize the thickness of the hairs

Thickness Seed - Variations in the hairs thickness

Thickness Levels - Amount of control points for the eyelashes thickness

Thickness Start - Thickness at the first control point

Thickness 1/3 - Thickness at the second control point

Thickness Mid - Thickness at the middle control point

Thickness 2/3 - Thickness at the fourth control point

Thickness End - Thickness at the last control point

Thickness 1/3 Point - The position of the second control point

Thickness Midpoint - The position of the middle control point

Thickness 2/3 Point - The position of the fourth control point 

Material:

Material - Material for the hairs

UV Map:

Settings for the Hairs UV map:

Pack UV Islands - Scale the islands of the UV map and move them so they fill the UV space as much as possible
Pack Margin - Space between islands
Pack Rotate - Rotate islands for best fit

Geometry

Settings for the output geometry:

Direction - The direction of the eyelashes (Left/Right eye)
Switch Direction - Switch the direction of the guide curve/mesh line. Use this to fix unexpected eyelashes direction. Otherwise it should be off.
Geometry Type - The type of eyelashes output geometry
Hairs Tilt - Set the tilt angle of individual hairs
Randomize Tilt - Randomize the tilt angle of the hairs
Offset From Face - Offset the eyelashes from the base surface
Fill Caps - Fill the caps of the hairs geometry to create a closed off mesh (3D strands only)

Resolution

Settings for the hairs mesh resolution:

Hairs Resolution - The number of points along the length of the hairs
Profile Resolution - Number of points along the profile of the hairs (3D strands only)

Miscellaneous

Base Mesh - Select the base mesh for the eyelashes. Hairs will grow on the base mesh surface.
Guide Smoothing - Smooth the initial guide curve/mesh line