That is Stature from the Young Avengers AKA Cassie Lange (Scott Lang's daughter). She's inherited his size changing ability, so I wanted a Giant Man sized version of her.
The whole figure is a FF Jessica Alba, not just the head. I had a customizer from Fwoosh make it for me way back when the Young Avengers box set came out. That set only included Hulking, Super Patriot, Wiccan, and Iron Lad (who was in what, 3 issues?), so I wanted to add Cassie and Kate to round out the team. Vision is part of the team as well, though he's not very different from the original. Wiccan's brother Speed joined the team later on as well, but it was near the end of the series, so I've let him go...for now.
The guy who made my Kate Bishop, Tigra, and Mockingbird is also making me a Crystal and Sersei, which should just about finish up my Avengers squad. I also had a spare Epic Force Leia and a Mystique sitting around, so I'm seeing what he can do for a Slave Leia as well. The only remaining figs I'd probably add to this group down the road are Quasar (90's male version) and maybe the old school Swordsman.