My uncle had a rainbow boa and it was SO aggressive... He had about a 50 50 shot that he'd get bitten more than once while cleaning its cage, and you could almost guarantee it would tag him once... Idk if all rainbow boa's are that way but its something to keep in mind. It seems like they can be really aggressive.

As for your boa.. I'd say nice normal, but I'm pretty sure its not a pastel.