Which poetic device is this hope a sparkle in your twinkling eyes?

The phrase "hope a sparkle in your twinkling eyes" is an example of a metaphor. A metaphor is a comparison between two unlike things that share some quality, without using the words "like" or "as." In this case, hope is being compared to a sparkle in someone's eyes. This comparison suggests that hope is something bright, lively, and full of potential.