No matter how well the decoration appears on a finished figurine, poorly painted features will ruin the effect.
It is important to understand the composition of the eye when painting features.
Black and dark brown are fine for lashes and eyebrows but make sure you keep colours in context, a blonde with black lashes and brows, just does not look right.
If you have trouble making fine lines in features, try the end of your lace tool. Tip it in colour and use it like a paint brush or fountain pen.
Producing good eyes is greatly enhanced when you know how to handle your brushes correctly