Alrighty, after playing with the style a lot I've come up with something I rather like. It took me ages on this one base, but I think she's lovely!
I'm leaving the three test-tube phases as-is because I love them, but the next three stages will all be in this style.
Another change; I've decided to go with my original plan of just doing raptors and will focus on variety in designs rather than species. With each of the last three stages there will be alternate male and female bases, each in different poses.
Female Adult Raptor: