Really cool design and I hope the band is great. But it is important to note that those baseball cards are copywritten images and using them in an advertising capacity could land you in some financial hot water.
I don't want to be a curmudgeon and I hope that's not going to be the case, but it's always important to remember the intellectual property laws in such things even when there is no direct financial gain on the use. My two decades in marketing have taught me such.
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