The Talis looks very much like the Romulan War-era craft that were floating around in the encyclopedia. Rather disappointed they didn't use that ship instead of bashing out an enemy green warbird (despite how awesome that warbird was, even without the bird underside).
The Volare looks interesting because it can still look like a retrofit of an earlier class... ie with new warp engines from stolen plans added to an existing hull (per Hasnen's dropped line in BoT that the Romulans Stole warp drive).
I can't ignore the perspective issues on the Imperial Hawk though, though the drawing is pretty.