I still feel that if the challenge rules state that imports or postwork is allowed that an image should be judged on whether or not it met the theme of the challenge,and not be precluded from voting because it includes models from another source.I agree with dhama's view on creating models from scratch in Bryce,and that Bryce is an excellent modelling app once you know how,but simply state this in the guidelines and there would be no need for further discussion.There are some amazing images that include outside models,and they should be judged on their artistic merit if the rules allow this,not blacklisted because the artist didn't take the time to attempt to create the model in Bryce...again,just my two cents worth!