Need help finding out anything about the artists of these

These were given to me by my Papa who's since passed. He was to say the least a very humble kind of beer connoisseur. Never that one guy who would think his knowledge of the subject makes him automatically better than you. He didn't say much about how he came to have them and being years since he gave them to me I don't recall much either. They are pastel paintings I believe from around the late 60's early 70's I'm guessing. C. J. Bates, J. Angus McLean and Kokomo Joe are the only names given on the paintings. Though looking on the internet I don't believe the matching people found are teh right ones. Just have the same names. Any help would be more than appreciated.