Tractor Thank You's

My son's first birthday party was the weekend before last and I'm getting ready to send out (ok, to print out) his Thank You cards.  Here is the illustration, to go along with the John Deere theme.

ink & digital painting

I considered filling the background with a wash, but because I'm printing this from my personal printer I'm playing it stingy and saving ink.  Maybe I'll play with it some other time.  Until then, I think it's pretty cute.