Crocheted Portrait of my Grandchildren

I  crocheted this portait of my grandchildren last Christmas 2016 for my daughter who is their mom. Seemed it was well received, she tells me even now how much she loves it. The piece is all single crocheted, several colors of yarn and is approx. 7'6" x 6'6" so it is very large and took about 3 month to make. I have to find away to either crochet faster or somehow speed up the process; another hand would be nice to do the computer stuff.