Applicator base

This would be your best starting point. it's a 'large' area to work on to flesh your ideas out and really showcase what your ideas are
I redrew the actual lioden applicator eye for this and added the pupils and eye shine on 3 separate layers, including 'intense' pupils.



here are a few I've made;

UI Base;

This would probably be your next step after the applicator base, but it doesn't really matter after that. It's a step lower in size and helps show off a smaller, more simplified version of your eyes.
I only edited the eyes and redrew the eye color, separating things into layers
I didn't add the shading as I couldn't really replicate it well

Lioness base (good)

most people like to use this pose or the 'kind' pose to really show off a mockup of the design. it may not seem like it, but this is an important step! you can go wild with the applicator base, they're meant to look detailed and nice. but if you can't capture the design on the scale it will actually be at, it's likely you won't have your idea approved

Binary eyes