WOW, these are super COOL!

Looking at the pictures, I think I do like your darkler colours better than the final ones on the t's.

Very unfortunate the people you created it for handled the things like they did. Why indeed not consult you when making changes? I do very much hope this gig will give you some good references for a next one. Maybe with other people? Or maybe with the same, when they let you. Always good to build up a portfolio. Aside to that, you may also try and launch your own shop selling your own creations. Though this would be harder to get to an audience, but I would consider to do that in parallel!

For how much are these t-shirts sold btw?