Here is a concept picture of Musa, Bloom, and Stella. (Notice that the outfits are less revealing... Hmm...) It is just one of about 125 concept art pictures that gamercatgirl found on wkw427's Photobucket account.
These pictures include Sparks (Domino for fans of RAI), Alfea, and Gardenia! I encourage you to check it out, they were awesome!
You can find the character concept art here. It also includes pics of the girls and the women they were molded after!