You're very welcome. I used to work for a small animal vet. I loved it when amstaffs would come in. They were always so nice to work on. It makes me angry that they have a bad reputation because a few idiots turn a small amount of them into nasty dogs.
This is a beautiful piece! I know your reason for the evil and good perfectly, I drew a similar piece before for my "Animal Club." If I am approximately on the right line, I am guessing that the Pit-Bull is good because of the loyalty to the owner. Though to the public the dog is evil because of the fights brought onto the dog. The dog is really good because the dog is born with a pure mind, but humans corrupt it. This is a magnificant piece! And from your gallery I can definetly tell you are a huge canine artist!