I do love it when you can tell someone really loves their job.
Hard to say what the uppermost emotion is here. Excitement? Pride? Or simple joie de vivre? In any case, it's clearly a sign made by someone who just can't contain their delight any longer. 'Look at us, Ma! We sell paint! They said we could never sell paint; that the paint market was stitched up by the big paint barons; that two fresh-faced kids from the sticks would never get anything out of the paint biz but a punch in the snoot and a hatful of broken dreams... but we stuck to it, Ma, and we showed 'em all! We sell paint! We're King of the Worrrrrld!'