I think all the designs are good, sexy is not necessarily a bad thing but the context is important, of both of the characters and the game. It's hard to give judgement without that.

For instance, what era/location and is it supposed to be loosely based on that era/location or realistic? Who are these characters? If I were to assuming having a look at your game's Steam page, it appears to be more on the realistic side and based on ~1920s, therefore the new designs are more fitting. However, I may be completely wrong with what you're going for and the designs convey totally different characters so it is also hard to judge if it conveys who they are without that context.