"vintage" robot painting

my mom had me do a painting for a family friend that had a baby boy recently, and the baby's room was decorated in a 'vintage robot' theme....here is the painting i did: 

i tried to make him look old-fashioned, and i used a yellowish glaze to make it resemble old paper :)

the numbers are his birthday and the "BBZ" stands for "baby ziebarth" (the family's last name)