Nice work on characters. Although, there are visible problems. Tifa's hands and Yuffie's upper torso look a problematic. But they are just minor problems. The biggest problem is Cloud. He is not the "Cloud" as we know anymore.
Barret and Tifa are undoubtedly the best. Can you post close-ups from them?
About publishing them, don't worry. Just post amongst this community via a file sharing service and keep a low profile. That way, it'll be qualified as Fair-Use and therefore, fully legal.