I think any gamer who has played or seen Valkyria will attest to the fact that the games unique water colors art style was one of the main draws for the game. I first remember when I saw screen shots of the game I was baffled as to whether they wear concept arts or in game screen shots it wasn’t until I saw the game in motion till I realised this was actually in game.
Anyway SEGA released an Art Book showcasing the beautiful art of the game with the developers and artistis discussing as well. Additionally the art book shows art that didn’t make it in the game such as the swim suit costume for Silveria (cause no art book is complete without objectifying the characters).
Check out some of the pages from the book at Kotaku.