This is an interesting image. I have a few gripes. The characters seem to be floating. I do not know a lot about poser lighting, but there needs to be some shadows cast. Also, I think that the idea of the costume is really cool...but with the background, the main costume ends up making this image a little too busy to fully enjoy.
With that said, I do not think it is a bad image by any means... I like it... the above gripes are just small parts of the whole picture.