Power Girl (Women of the DCU, Series 1)
Designed by Adam Hughes, sculpted by , this mini bust measures approximately 5.625" Tall, 4" Wide, and 2.25" Deep. I have number 4021 of 6000
If you read my thoughts on the Donna Troy mini bust, you'll see I noted that her base is quite small, considering her upper frame. Power Girl here is similarly well endowed on top (both in the feminine way, and in the design of the bust), along with having a quite narrow base, but she doesn't seem to have the balance issue that I notice with Donna.
See also the complete Women of the DC Universe Checklist