Hi trying to make the empty eyes look and I can't seem to figure it out

It's all about the shadding and softening the edges. A little darker spot at the middle of the eye is pretty nice too

First of all, what program do you want to use for that?

I tend to use photoshop

Photoshop have a gradant tool. just need to choose the right colors.

Personally, for manual gradants I prefer Sai2