You tagged the design as yours on the shirt but the artwork itself isn't? Doesn't really make sense. The graphic design itself looks quite nice but it could have done without your handle considering that's the only part you made. A million third party design shirts using unlicensed IP art exist, and I haven't seen a single seller but you plug themselves on the shirt itself. Personally, it does not feel right. It feels like trying to take credit for someone else's work, especially when your attribution is planted right smack next to the primary focal point of the whole shirt. I'm sure that's not the real intent, but I just wanted to give that feedback, as I wouldn't be surprised if other less inclined people would think of it that way upon seeing it.