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That's your job ;)
Besides, in an unlayered .PNG i'd have to cut out the designs manually to move them and that'd be fugly/inefficient. I only meant to say that the shirts could look even better if you optimise the placement of the motifs.

it is PNG with blank background so one can easily place them on any color. Its easy. anyway I am just a starter, i am learning to use adobe creative suite thats better for designing. i am happy response is good can work now with more motivation.

Yeah, keep it up!