You should be perfectly fine since the costumes didn't win an award. It's only frowned upon when you've won a major award before with the same costume, especially if you go from entering it the second time at a smaller convention than the one you previously won at.
2014 Conventions :
Katsucon (Washington, DC) - Megacon (FL) - Colossalcon (OH)
Upcoming costumes : NiGHTS from NiGHTS: Journey of Dreams, Princess Kraehe (anime) from Princess Tutu, and Zidane Tribal from FFIX!