I have used these sheets on a t-shirt quilt. They didn’t turn out badly at all, some fading, which I expected, but they’re still perfectly clear and recognizable. It will, over time, start to “crackle”, as you can see in this picture. This quilt has probably been washed 30 or 40 times, as I use it all the time.
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However, I suggest making sure every single part of the picture is well adhered. I didn’t get the bottom edge of this picture completely ironed down, and lost part of the picture.
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You can see on our legs where it came away from the quilt.
Nothing is going to be perfect unless you have the pics professionally done on fabric, but this worked for what I needed. Good luck!