I really like the idea and colors on this! The interactivity between the characters are really nice.
If I could say one thing though, the "is" isn't obvious. If I didn't read the title, I might not have seen it at all. My suggestion would to increase the negative space around it, potentially by increasing the arm-length of the two whose tails make the word. Or alternately, play a little more with line-weight.
Thank you, those are good observations! But the shirts are long past made. This is from 2014, and I only formed a moderately solid sense of how to clarify and draw attention to specific image aspects within this past year.
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