I also enjoy painting art and I'm in my 70s. Please tell your boys that as long as you put your heart into it then it doesn't matter what others think. Art is just a way to express yourself. How art is viewed, interrelated, and appreciated is always personal to each different person.
For me, I really liked all of these art works and hope you guys will share more. And I want to share more of mine as well if I can get my nephew to help me take digital photos.
Good job boys!