Makeup artists choose the right false lashes for their clients by considering:

1. _Eye shape_: Selecting lashes that complement the client's eye shape (e.g., almond, round, hooded).
2. _Eye size_: Choosing lashes that are proportionate to the client's eye size.
3. _Lash line_: Selecting lashes that follow the natural lash line or create a desired shape.
4. _Lash style_: Choosing from natural, dramatic, cat eye, or other styles to suit the client's look.
5. _Lash material_: Selecting from human hair, synthetic, or mink lashes based on client preferences.
6. _Lash length and volume_: Choosing lashes that add desired length and volume.
7. _Client's preferences_: Considering the client's personal style, comfort level, and desired look.
8. _Occasion_: Selecting lashes appropriate for the occasion (e.g., natural for everyday, dramatic for evening).
9. _Face shape_: Considering the client's face shape and how the lashes will frame their features.
10. _Comfort and durability_: Ensuring the lashes are comfortable and long-lasting.

By considering these factors, makeup artists can choose the perfect false lashes to enhance their clients' eyes and complete their desired look.