Like you, I never draw people. I find it so much harder. I think this is a great gift for your dad and I know he likes it. John Lennon is my favorite beatle and subject in this picture. I agree that George's iris look a little big, but other then that I really don't see anything not to like about this drawing! It's really good! Are you going to draw Paul and Ringo too?

Keep up the awesome work, I really like this. AND when you're all done please show us the finished product.