Liquid liner can be especially tricky here are some tips for application:
1) Get the right liquid liner with a precise brush here is the one I am using in the video https://www.beautycounter.com/product/precision-liquid-eyeliner on sale right now for $21
2) Use shadow, gel, or pencil liner as a rough guide for where the liner will go
3) Pull corners of eyes gently to allow liner to glide smoothly across skin