🌺 Demo

3D Eyelashes may have complex shapes, including stylized ones like this one. It can become really complicated to Rig Eyelashes, because on one hand, the (Top) Eyelash must follow the expressive, curvy shape of the (Top) Eyelid Edge/Border, on another hand, the (Top) Eyelash requires to have a synchronous, specific Deformation where it 'turns upward' when the Eye is more open, and it 'turns downward' when the Eye is more closed. These effects (kind of an inverse "Follow Through" -which is an Animation concept) can be very hard to achieve without actually having the (Top) Eyelash Mesh completely messed up in terms of its original form.
One way that I know can solve this issue properly is using Shape Keys for the Eyelash Deformation (of turning up-down); but in this case I was able to solve it without Shape Keys, relying on Advanced Organic Rigging concepts. For example, if the Eyelash Mesh was to be Deformed by Rotating Deform Bones, this would probably cause unwanted degrees of Mesh disruptions, due to at least some of the main Skinning algorithms Blender uses… but because those Eyelashes Mesh regions are so small in the model and have unfamiliar shapes, if we are not aware of such Skinning problematics, we might totally miss the point why those Mesh Rotations wouldn't be working on a clean way -and this is one of the reasons Shape Keys' approach is a workaround to Deform Bones' Rotations on this particular Eyelashes Rig.
Alternatively, the idea of solving those Mesh Rotations with "Spline Skinning" (either by using Bendy Bones or Spline IK Bone Constraint), although interesting, in practice it seems overwhelming in terms of keeping things simple and elegant, since these solutions tend to require plenty of controllers -hence, it may become very complicated for 'Posing the Eyelashes', even if the visual results is good.
In this Demo, there is automation for the (Top) Eyelash's 'Rotation', using a combo of Copy Location & Transformation Bone Constraints. So, the (Top) Eyelash Deform Bones are not Rotating, just moving up or down according to customization, and this must be addressed in a way that is very peculiar to the current 3D Character Design.

[@fandeasanh3092]

Could you explain it again like im having no idea how to bone the mesh 🙏🙏

[@pxy-gnomes9781]

Hi, sorry for delay.
Ok, so it would be a bit difficult to explain in here; basically, there are 2 Rigs going on there: the Eyelids Rig and the Eyelashes Rig; they are related, but they are different things; the Eyelids Rig is actually the most challenging one.
Maybe you know already, but this year (2024), I've made have a free Gumroad Blender file for the Eyelids Rig with different setups/variations, so you can check there (there's also a video playlist for building the Rig stuff, but it's not like clean tutorials unfortunately).
animaticblender.gumroad.com/l/4eyelidsrigsetups?_gl=1*1f7zgc3*_ga*MTk3NTg0MzQxMS4xNjg4MTk1MDQ4*_ga_6LJN6D94N6*MTcwOTEwNDc1MC4zMS4wLjE3MDkxMDQ3NTAuMC4wLjA
For the Eyelashes Rig, actually I have got an improved variation of it. You can see the building process in this last video of the playlist (so it is actually the most important video, because the Eyelashes Rig is not present in the Eyelids Rig Blender file); Note that I've set the timestamp directly to where the building process starts (for the Eyelashes Rig):
ua-cam.com/video/WdbRELd-W4A/v-deo.html