for 3d work, it might be a good practice to share the 3d file and texture file so others can get a more hands on approach with their critiques.. otherwise people are left to only looking at it.. this is simply a suggestion, not a requirement.

The biggest problem with doing this is that others can and might take parts of it and call it their own. While no self respecting artist ever would, that doesn't mean others won't. It's a risk, especially if your work is quality. And since the ripper has the model and skin, it can look more legitimate to the people they are trying to fool.