Congratulations!
I share the joy of a first Deer or a Buck having expierenced the same myself this year. The first will be always remembered and he has nothing to be ashamed of for it being a small 6. Mine was a small 7 and it is still exciting to think about weeks later. Savor the moment and let him talk about it as long as he remains excited and want's to share the thrill of the first kill!. Good Hunting!