paulo
in summary, someone gave you a picture, you sort of copied it and they liked the fact that it was nearly the same. Have I missed anything ?
Well, other than the fact that what they gave me would have looked awful on a tee-shirt. and so.....

I had to create art that would translate well on a tee-shirt. That's what I did. Then I printed 47 shirts for them.
Beyond that you've not missed anything.
Oh yeah, I got paid for it all too.